CHAPTER XLI.

_WORKSHOP EXPERIENCE._

To urge the necessity of learning practical fitting as a part of an engineering education is superfluous. A mechanical engineer who has not been "through the shop" can never expect to attain success, nor command the respect even of the most inferior workmen; without a power of influencing and controlling others, he is neither fitted to direct construction, nor to manage details of any kind connected with engineering industry. There is nothing that more provokes a feeling of resentment in the mind of a skilled man than to meet with those who have attempted to qualify themselves in the theoretical and commercial details of engineering work, and then assume to direct labour which they do not understand; nor is a skilled man long in detecting an engineer of this class; a dozen words in conversation upon any mechanical subject is generally enough to furnish a clue to the amount of practical knowledge possessed by the speaker.

As remarked in a previous place, no one can expect to prepare successful designs for machinery, who does not understand the details of its construction; he should know how each piece is moulded, forged, turned, planed, or bored, and the relative cost of these processes by the different methods which may be adopted.

An engineer may direct and control work without a knowledge of practical fitting, but such control is merely a commercial one, and cannot of course extend to mechanical details which are generally the vital part; the obedience that may thus be enforced in controlling others is not to be confounded with the respect which a superior knowledge of work commands.

A gain from learning practical fitting is the confidence which such knowledge inspires in either the direction of work or the preparation of plans for machinery. An engineer who hesitates in his plans for fear of criticism, or who does not feel a perfect confidence in them, will never achieve much success.

Improvements, which have totally changed machine fitting during thirty years past, have been of a character to dispense in a great measure with hand skill, and supplant it with what may be termed mental skill. The mere physical effect produced by a man's hands has steadily diminished in value, until it has now almost come to be reckoned in foot-pounds; but the necessity for practical knowledge instead of being diminished is increased.

Formerly an apprentice entered a shop to learn hand skill, and to acquaint himself with a number of mysterious processes; to learn a series of arbitrary rules which might serve to place him at a disadvantage even with those whose capacity was inferior and who had less education; but now the whole is changed. An engineer apprentice enters the shop with a confidence that he may learn whatever the facilities afford if he will put forth the required efforts; there are no mysteries to be solved; nearly all problems are reached and explained by science, leaving a greater share of the shop-time of a learner to be devoted to studying what is special.

This change in engineering pursuits has also produced a change in the workmen almost as thorough as in manipulation. A man who deals with special knowledge only and feels that the secrets of his calling are not governed by systematic rules, by which others may qualify themselves without his assistance, is always more or less narrow-minded and ignorant. The nature of his relations to others makes him so; of this no better proof is wanted than to contrast the intelligence of workmen who are engaged in what may be termed exclusive callings with people whose pursuits are regulated by general rules and principles. A machinist of modern times, having outgrown this exclusive idea, has been raised thereby to a social position confessedly superior to that of most other mechanics, so that shop association once so dreaded by those who would otherwise have become mechanics, is no longer an obstacle.

Some hints will now be given relating to apprentice experience in a workshop, such matters being selected as are most likely to be of interest and use to a learner.

Upon entering a shop the first thing to be done is to gain the confidence and the respect of the manager or foreman who has charge of the work; to gain such confidence and respect is different from, and has nothing to do with, social relations and must depend wholly upon what transpires in the works. To inspire the confidence of a friend one must be kind, faithful, and honourable; but to command the confidence of a foreman one must be punctual, diligent, and intelligent. There are no more kindly sentiments than those which may be founded on a regard for industry and earnest effort. A learner may have the misfortune to break tools, spoil work, and fail in every way to satisfy himself, yet if he is punctual, diligent, and manifests an interest in the work, his misfortunes will not cause unkind resentment.

It must always be remembered that what is to be learned should not be estimated according to a learner's ideas of its importance. A manager and workmen generally look upon fitting as one of the most honourable and intelligent of pursuits, deserving of the respect and best efforts of an apprentice; and while a learner may not think it a serious thing to make a bad fit, or to meet with an accident, his estimate is not the one to judge from. The least word or act which will lead workmen to think that an apprentice is indifferent, at once destroys interest in his success, and cuts off one of the main sources from which information may be derived.

An apprentice in entering the workshop should avoid everything tending to an appearance of fastidiousness, either of manner or dress; nothing is more repulsive to workmen, and it may be added, nothing is more out of place in a machine shop than to divide one's time between the work and an attempt to keep clean. An effort to keep as neat as the nature of the work will admit is at all times right, but to dress in clothing not appropriate, or to allow a fear of grease to interfere with the performance of work, is sure to provoke derision.

The art of keeping reasonably clean even in a machine shop is worth studying; some men are greased from head to foot in a few hours, no matter what their work may be; while others will perform almost any kind of work, and keep clean without sacrificing convenience in the least. This difference is the result of habits readily acquired and easily retained.

Punctuality costs nothing, and buys a great deal; a learner who reaches the shop a quarter of an hour before starting time, and spends that time in looking about, manifests thereby an interest in the work, and avails himself of an important privilege, one of the most effectual in gaining shop knowledge. Ten minutes spent in walking about, noting the changes wrought in the work from day to day, furnishes constant material for thought, and acquaints a learner with many things which would otherwise escape attention. It requires, however, no little care and discrimination to avoid a kind of resentment which workmen feel in having their work examined, especially if they have met with an accident or made a mistake, and when such inspection is thought to be prompted by curiosity only. The better plan in such cases is to ask permission to examine work in such a way that no one will hear the request except the person addressed; such an application generally will secure both consent and explanation.

Politeness is as indispensable to a learner in a machine shop as it is to a gentleman in society. The character of the courtesy may be modified to suit the circumstances and the person, but still it is courtesy. An apprentice may understand differential calculus, but a workman may understand how to bore a steam cylinder; and in the workman's estimation a problem in calculus is a trivial thing to understand compared with the boring of a steam engine cylinder. Under these circumstances, if a workman is not allowed to balance some of his knowledge against politeness, an apprentice is placed at a disadvantage.

Questions and answers constitute the principal medium for acquiring technical information, and engineering apprentices should carefully study the philosophy of questions and answers, just as he does the principles of machinery. Without the art of questioning but slow progress will be made in learning shop manipulation. A proper question is one which the person asked will understand, and the answer be understood when it is given; not an easy rule, but a correct one. The main point is to consider questions before they are asked; make them relevant to the work in hand, and not too many. To ask frequent questions, is to convey an impression that the answers are not considered, an inference which is certainly a fair one, if the questions relate to a subject demanding some consideration. If a man is asked one minute what diametrical pitch means, and the next minute how much cast iron shrinks in cooling, he is very apt to be disgusted, and think the second question not worth answering.

It is important, in asking questions, to consider the mood and present occupation of the person addressed; one question asked when a man's mind is not too much occupied, and when he is in a communicative humour, is worth a dozen questions asked when he is engaged, and not disposed to talk.

It is a matter of courtesy in the usages of a shop, and one of expediency to a learner, to ask questions from those who are presumed to be best informed on the subject to which the questions relate; and it is equally a matter of courtesy to ask questions of different workmen, being careful, however, never to ask two different persons the same question, nor questions that may call out conflicting answers.

There is not a more generous or kindly feeling in the world than that with which a skilled mechanic will share his knowledge with those who have gained his esteem, and who he thinks merit and desire the aid that he can give.

An excellent plan to retain what is learned, is to make notes. There is nothing will assist the memory more in learning mechanics than to write down facts as they are learned, even if such memoranda are never referred to after they are made.

It is not intended to recommend writing down rules or tables relating to shop manipulation so much as facts which require remark or comment to impress them on the memory; writing notes not only assists in committing the subjects to memory, but cultivates a power of composing technical descriptions, a very necessary part of an engineering education. Specifications for engineering work are a most difficult kind of composition and may be made long, tedious, and irrelevant, or concise and lucid.

There are also a large number of conventional phrases and endless technicalities to be learned, and to write them will assist in committing them to memory and decide their orthography.

In making notes, as much as possible of what is written should be condensed into brief formulæ, a form of expression which is fast becoming the written language of machine shops. Reading formulæ is in a great degree a matter of habit, like studying mechanical drawings; that which at the beginning is a maze of complexity, after a time becomes intelligible and clear at a glance.

Upon entering the shop, a learner will generally, to use a shop phrase, "be introduced to a hammer and chisel;" he will, perhaps, regard these hand tools with a kind of contempt. Seeing other operations carried on by power, and the machines in charge of skilled men, he is likely to esteem chipping and filing as of but little importance and mainly intended for keeping apprentices employed. But long after, when a score of years has been added to his experience, the hammer, chisel, and file, will remain the most crucial test of his hand skill, and after learning to manipulate power tools of all kinds in the most thorough manner, a few blows with a chipping hammer, or a half-dozen strokes with a file, will not only be a more difficult test of skill, but one most likely to be met with.

To learn to chip and file is indispensable, if for no other purpose, to be able to judge of the proficiency of others or to instruct them. Chipping and filing are purely matters of hand skill, tedious to learn, but when once acquired, are never forgotten. The use of a file is an interesting problem to study, and one of no little intricacy; in filing across a surface one inch wide, with a file twelve inches long, the pressure required at each end to guide it level may change at each stroke from nothing to twenty pounds or more; the nice sense of feeling which determines this is a matter of habit acquired by long practice. It is a wonder indeed that true surfaces can be made with a file, or even that a file can be used at all, except for rough work.

If asked for advice as to the most important object for an apprentice to aim at in beginning his fitting course, nine out of ten experienced men will say, "to do work well." As power is measured by force and velocity, work is measured by the two conditions of skill and time. The first consideration being, how well a thing may be done, and secondly, in how short a time may it be performed; the skill spent on a piece of work is the measure of its worth; if work is badly executed, it makes no difference how short the time of performance has been; this can add nothing to the value of what is done although the expense is diminished.

A learner is apt to reverse this proposition at the beginning, and place time before skill, but if he will note what passes around him, it will be seen that criticism is always first directed to the character of work performed. A manager does not ask a workman how long a time was consumed in preparing a piece of work until its character has been passed upon; in short, the quality of work is its mechanical standard, and the time consumed in preparing work is its commercial standard. A job is never properly done when the workman who performed it can see faults, and in machine fitting, as a rule, the best skill that can be applied is no more than the conditions call for; so that the first thing to be learned is to perform work well, and afterwards to perform it rapidly.

Good fitting is often not so much a question of skill as of the standard which a workman has fixed in his mind, and to which all that he does will more or less conform. If this standard is one of exactness and precision, all that is performed, whether it be filing, turning, planing, or drawing, will come to this standard. This faculty of mind can be defined no further than to say that it is an aversion to whatever is imperfect, and a love for what is exact and precise. There is no faculty which has so much to do with success in mechanical pursuits, nor is there any trait more susceptible of cultivation. Methodical exactness, reasoning, and persistence are the powers which lead to proficiency in engineering pursuits.

There is, perhaps, no more fitting conclusion to these suggestions for apprentices than a word about health and strength. It was remarked in connection with the subject of drawing, that the powers of a mechanical engineer were to be measured by his education and mental abilities, no more than by his vitality and physical strength, a proposition which it will be well for an apprentice to keep in mind.

One not accustomed to manual labour will, after commencing, find his limbs aching, his hands sore; he will feel exhausted both at the beginning and at the end of a day's work. These are not dangerous symptoms. He has only to wait until his system is built up so as to sustain this new draught upon its resources, and until nature furnishes a power of endurance, which will in the end be a source of pride, and add a score of years to life. Have plenty of sleep, plenty of plain, substantial food, keep the skin clean and active, laugh at privations, and cultivate a spirit of self-sacrifice and a pride in endurance that will court the hardest and longest efforts. An apprentice who has not the spirit and firmness to endure physical labour, and adapt himself to the conditions of a workshop, should select some pursuit of a nature less aggressive than mechanical engineering.

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BOOKS RELATING TO MACHINE TOOLS AND MANUFACTURING PROCESSES.

BY J. RICHARDS.

_The Economy of Workshop Manipulation._

A LOGICAL METHOD OF LEARNING CONSTRUCTIVE MECHANICS.

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Bridges.

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Cotton Cultivation.

Cotton Cultivation in its various details, the Barrage of Great Rivers, and Instructions for Irrigating, Embanking, Draining, and Tilling Land in Tropical and other Countries possessing high thermometric temperatures, especially adapted to the improvement of the cultural soils of India, by Joseph Gibbs, Member Institute Civil Engineers, _with 5 plates_, crown 8vo, cloth 7 6

Curves, Railway.

Treatise on the setting out of Railway Curves, with full Tables of the Angles, Distances, and Offsets required, especially arranged for the use of Measurements in feet and imperial links, but also adapted for the use of any other unit of Measurement, by David Livingstone, crown 8vo, cloth 10 6

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Tables for setting out Railway Curves, arranged by Chas. Pullar Hogg, C.E., a series of cards arranged for Manipulation, with a sheet of Explanations and Examples, in neat cloth case 4 6

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Earthwork Tables.

Tables for Computing the Contents of Earthwork in the Cuttings and Embankments of Railways, by W. Macgregor, royal 8vo, cloth 6 0

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Electrical Standards.

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Engineers' Pocket-Book.

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Applebys' Illustrated Handbook of Machinery and Iron Work, with the Cost, the Working Expenses, and the Results obtained in the use of Steam and Hand Cranes, Pumps, Fixed and Portable Steam Engines, and various other Machines; with Weight, Measurement, etc., etc.; also Prices of Tools, Iron Works, Stores, and Materials required by Civil and Mechanical Engineers, Merchants, and others; together with numerous Tables and Memoranda, by Appleby Bros., Engineers, _many hundred wood engravings_, 8vo, cloth 12 6

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French-Polishing.

The French-Polisher's Manual, by a French-Polisher, containing Timber Staining, Washing, Matching, Improving, Painting, Imitations, Directions for Staining, Sizing, Embodying, Smoothing, Spirit Varnishing, French-Polishing, Directions for Re-polishing, royal 32mo, sewed 0 6

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Analysis, Technical Valuation, Purification and Use of Coal Gas, by the Rev. W. R. Bowditch, M.A., _with wood engravings_, 8vo, cloth 12 6

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Iron.

Iron as a material of Construction, forming a Handbook for the use of Students in Engineering, by William Pole, C.E., F.R.S., _cuts_, post 8vo, cloth 6 0

Iron and Steel.

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Indian Engineering.

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Link-Motion.

Link-Motion and Expansion-Gear practically considered, by N. P. Burgh, Engineer, _illustrated with 90 plates and 229 wood engravings_, small 4to, handsomely half-bound in morocco £2 2 0

Mechanical Engineering.

The Mechanician and Constructor for Engineers, comprising Forging, Planing, Lining, Slotting, Shaping, Turning, Screw Cutting, etc., by Cameron Knight, _illustrated by 96_ 4to _plates, containing 1147 illustrations, and 397 pages of letterpress_, 4to, cloth £2 10 0 Or, half-bound French morocco 2 12 6

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Metric Weights and Measures.

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Millwright's Guide.

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Mine Engineering.

A Practical Treatise on Coal Mining, by George G. André, Mining Civil Engineer, F.G.S., Assoc. Inst. C.E., _numerous plates_, 2 vols., royal 4to, cloth £3 12 0

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Records of Mining and Metallurgy; or, Facts and Memoranda for the use of the Mine Agent and Smelter, by J. Arthur Phillips and John Darlington, in crown 8vo, cloth, _illustrated with wood engravings_ 4 0

Narrow Gauge Railways.

Narrow Gauge Railways, by C. E. Spooner, C.E., F.G.S., _illustrated with 25 folding plates_, 8vo, cloth 12 6

CONTENTS:

Copy of paper read at the "Inventors' Institute" on Narrow Gauge Railways--the Festiniog Railway--Experiment on the Festiniog Railway--Captain Tyler's Report--The Railways of the Future--Advantages gained by Narrow Gauge Railways--Railway Gauges--Narrow Gauge Rolling Stock--Battle of the Gauges--Indian Railway Gauges and Rolling Stock, etc.

Pyrology.

Pyrology, or Fire Chemistry; a Science interesting to the general Philosopher, and an art of infinite importance to the Chemist, Mineralogist, Metallurgist, Geologist, Agriculturist, Engineer (Mining, Civil, and Military), etc., etc., by William Alexander Ross, lately a Major in the Royal Artillery, _with plates and woodcuts_, crown 4to, cloth £1 16 0

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Railway Engineering.

Manual of Railway Engineering, for the Field and the Office, by Charles P. Cotton, C.E., second edition, revised and enlarged, post 8vo, cloth 7 6

Rennie, Sir John.

The Autobiography of Sir John Rennie, Past-President of the Institution of Civil Engineers, F.R.S., etc., etc., edited by his son, C. G. C. Rennie, _with portrait_, 8vo, cloth 12 6

Reservoirs.

On the Construction of Catch-water Reservoirs in Mountain Districts for the supply of Towns, or for other purposes, by C. H. Beloe, Author of 'The Handbook of the Liverpool Water-works,' _plates_, 8vo, cloth 5 0

Retaining Walls.

Surcharged and different Forms of Retaining Walls, by J. S. Tate, _cuts_, 8vo, sewed 2 0

Ropemaking.

A Treatise on Ropemaking as practised in public and private Rope-yards, with a description of the manufacture, rules, tables of weights, etc., adapted to the Trade, Shipping, Mining, Railways, Builders, etc., by R. Chapman, formerly foreman to Messrs. Huddart and Co., Limehouse, and late Master Ropemaker to H.M. Dockyard, Deptford, second edition, 12mo, cloth 3 0

Sanitary Engineering.

A Series of Lectures given before the School of Engineering, Chatham. Division I. Air. Division II. Water. Division III. The Dwelling. Division IV. The Town and Village. Division V. The Disposal of Sewage. Copiously illustrated. By J. Bailey Denton, C.E., F.G.S., Honorary Member of the Agricultural Societies of Norway, Sweden, and Hanover, and author of the 'Farm Homesteads of England,' 'Storage of Water,' etc., etc., royal 8vo, cloth 21 0

Sanitary Engineering.

Proceedings of the Association of Municipal and Sanitary Engineers and Surveyors, Vol. I., 1873-4, edited by Lewis Angell, Mem. Inst. C.E., F.R.I.B.A., etc., etc., 8vo, cloth 10 6

Sewage.

A Handbook of Sewage Utilization, by Ulick Ralph Burke, Esq., Barrister-at-Law, crown 8vo, cloth 3 6

This work treats: I. Of the evils of the present system of Sewage Treatment, the Pollution of Water, and the Waste of Manure. II. Remedies, Privy, and Ash-pit; Eureka System; Milan, Goul, and Moule's Systems. III. Treatment of Sewage by Chemical means; Experiments with Lime; Lime and Chloride of Iron; Sulphate of Ammonia; Holden's Process; Sulphate of Alumina; Persalts of Iron; Blyth, Lenk, Phosphate, A.B.C., Scott, and Hille Processes; Filtration. IV. Irrigation. With an APPENDIX, including the Law relating to Sewage Utilization.

Sewage.

The Sewage Question; on the Treatment and Utilization of Sewage, the Preparation of Land for Irrigation, and for Intermittent Downward Filtration, by J. Bailey Denton, Mem. Inst. C.E., F.G.S., 8vo, sewed 2 0

Silver Mines.

Vazeeri Rupi, the Silver Country of the Vazeers, in Kulu: its Beauties, Antiquities, and Silver Mines, including a Trip over the lower Himalayah Range and Glaciers, by J. Calvert, F.G.S., Mem. Inst. C.E., _illustrated with a map and coloured plates_, 8vo, cloth 16 0

Slide Valve.

The Slide-Valve practically considered, by N. P. Burgh, Engineer, fifth edition, _containing 88 illustrations and 121 pages of letterpress_, crown 8vo, cloth 5 0

Slide Valve. Designing Valve-gearing.

A Treatise on a Practical Method of Designing Slide Valve Gearing by Simple Geometrical Construction, based upon the principles enunciated in Euclid's Elements, and comprising the various forms of Plain Slide Valve and Expansion Gearing; together with Stephenson's, Gooch's, and Allan's Link-Motions, as applied either to reversing or to variable expansion combinations, by Edward J. Cowling Welch, Memb. Inst. Mechanical Engineers, crown 8vo, cloth 6 0

The system described in this work enables any draughtsman or foreman to "get out" in a _few minutes_, and with the greatest precision, all the details of a Slide Valve Gear, without recourse to models or other similar appliances.

Steam Boilers.

Practical Treatise on Steam Boilers and Boiler Making, by N. P. Burgh, Mem. Inst. Mec. Eng., _illustrated by 1163 wood engravings and 50 large folding plates of working drawings_, royal 4to, half-morocco £3 13 6

Steam Engine.

Modern Marine Engineering applied to Paddle and Screw Propulsion; consisting of _36 plates, 259 wood engravings_, and 403 pages of descriptive matter, the whole being an exposition of the present practice of the following firms: Messrs. J. Penn and Sons; Maudslay, Sons, and Field; James Watt and Co.; J. and G. Rennie; R. Napier and Sons; J. and W. Dudgeon; Ravenhill and Hodgson; Humphreys and Tennant; Mr J. F. Spencer; and Messrs. Forester and Co. By N. P. Burgh, Engineer, 4to, cloth £2 5 0

Steam Engine.

Modern Compound Engines, being a Supplement to Modern Marine Engineering, by N. P. Burgh, Mem. Inst. Mech. Eng., _numerous large plates of working drawings_, 4to, cloth 18 0

The following Firms have contributed Working Drawings of their best and most modern examples of Engines fitted in the Royal and Mercantile Navies: Messrs. Maudslay, Rennie, Watt, Dudgeon, Humphreys, Ravenhill, Jackson, Perkins, Napier, Elder, Laird, Day, Allibon.

Steam Engine.

Practical Treatise on the Condensation of Steam; contained in 262 pages of letterpress, _and illustrated with 212 engravings_, by N. P. Burgh, Engineer, super royal 8vo, cloth £1 5 0

Steam Engine.

Practical Illustrations of Land and Marine Engines, showing in detail the modern improvements of High and Low Pressure, Surface Condensation and Superheating, together with Land and Marine Boilers, by N. P. Burgh, Engineer, _20 plates in double elephant_, folio, cloth £2 2 0

Steam Engine.

A Pocket-Book of Practical Rules for the Proportions of Modern Engines and Boilers for Land and Marine purposes, by N. P. Burgh, fifth edition, revised, with Appendix, royal 32mo, roan 4 6

Details of High-Pressure Engine, Beam Engine, Condensing, Marine Screw Engines, Oscillating Engines, Valves, etc., Land and Marine Boilers, Proportions of Engines produced by the rules, Proportions of Boilers, etc.

Steep Gradients on Railways.

A Treatise on the Improved Method for overcoming Steep Gradients on Railways, whereby an ordinary locomotive capable of hauling a given load up a gradient 1 in 80, can take the same up 1 in 8, by Henry Handyside, 8vo, sewed 1 0

Strength of Beams.

On the Strength of Beams, Columns, and Arches, considered with a view to deriving methods of ascertaining the practical strength of any given section of Beam, Column, or Arch, in Cast Iron, Wrought Iron, or Steel, by B. Baker, _numerous cuts_, crown 8vo, cloth 9 0

Strength of Beams.

New Formulas for the Loads and Deflections of Solid Beams and Girders, by William Donaldson, M.A., Assoc. Inst. C.E., 8vo, cloth 4 6

Sugar.

The Practical Sugar Planter; a complete account of the cultivation and manufacture of the sugar-cane, according to the latest and most improved processes, describing and comparing the different systems pursued in the East and West Indies, and the Straits of Malacca, and the relative expenses and advantages attendant upon each, being the result of sixteen years' experience of a sugar-planter in those countries, by Leonard Wray, Esq., _with numerous illustrations_, 8vo, cloth 10 6

Short Logarithms.

Short Logarithmic and other Tables, intended to facilitate Practical Calculations, and for solving Arithmetical Problems in class, 8vo, sewed 1 0

Ditto, cloth 1 6

Sulphuric Acid.

The Chemistry of Sulphuric Acid Manufacture, by Henry Arthur Smith, _cuts_, crown 8vo, cloth 4 6

Surveying.

The Principles and Practice of Engineering, Trigonometrical, Subterraneous, and Marine Surveying, by Charles Bourne, C.E., third edition, _numerous plates and woodcuts_, 8vo, cloth 5 0

Surveying.

A Practical Treatise on the Science of Land and Engineering Surveying, Levelling, Estimating Quantities, etc., with a general description of the several Instruments required for Surveying, Levelling, Plotting, etc., by H. S. Merrett, _41 fine plates, with illustrations and tables_, royal 8vo, cloth, 2nd edition 12 6

Table of Logarithms.

Table of Logarithms of the Natural Numbers, from 1 to 108,000, by Charles Babbage, Esq., M.A., Stereotyped edition, royal 8vo, cloth 7 6

Tables of Squares and Cubes.

Barlow's Tables of Squares, Cubes, Square Roots, Cube Roots, Reciprocals of all Integer Numbers up to 10,000, post 8vo, cloth 6 0

Teeth of Wheels.

Camus (M.) Treatise on the Teeth of Wheels, demonstrating the best forms which can be given to them for the purposes of Machinery, such as Mill-work and Clock-work, and the art of finding their numbers, translated from the French, third edition, carefully revised and enlarged, with details of the present practice of Millwrights, Engine Makers, and other Machinists, by Isaac Hawkins, _illustrated by 18 plates_, 8vo, cloth 5 0

Telegraphy.

Journal of the Society of Telegraph Engineers, including original Communications on Telegraphy and Electrical Science, edited by Major Frank Bolton and G. E. Preece, Parts I. to XII., demy 8vo, sewed, _with wood engravings_, each 5 0

To be continued quarterly.

Torpedo Warfare.

A Treatise on Coast Defence; based on the experience gained by Officers of the Corps of Engineers of the Army of the Confederate States, and compiled from Official Reports of Officers of the Navy of the United States, made during the North American War from 1861 to 1865, by Von Scheliha, Lieutenant-Colonel and Chief Engineer of the Department of the Gulf of Mexico, of the Army of the late Confederate States of America; _with numerous fine plates_, imperial 8vo, cloth, top edge gilt 15 0

Trevithick.

The Life of Richard Trevithick (Inventor of the High-pressure Steam-engine), with an account of his Inventions, by Francis Trevithick, C.E., 2 vols., medium 8vo, cloth, _illustrated by a steel portrait, lithographs, and numerous beautiful wood engravings, including many accurate illustrations of Cornwall, its Mines, and Mining Machinery_, reduced to 12 6

Turbine.

A Practical Treatise on the Construction of Horizontal and Vertical Waterwheels, _with 11 plates_, specially designed for the use of operative mechanics, by William Cullen, Millwright and Engineer, second edition, revised and enlarged, small 4to, cloth 12 6

Turning.

The Practice of Hand-turning in Wood, Ivory, Shell, etc., with Instructions for Turning such work in Metal as may be required in the Practice of Turning in Wood, Ivory, etc., also an Appendix on Ornamental Turning, by Francis Campin, second edition, _with wood engravings_, crown 8vo, cloth (a book for beginners) 6 0

Valve-Gears.

Treatise on Valve-Gears, with special consideration of the Link-Motions of Locomotive Engines, by Dr. Gustav Zeuner, third edition, revised and enlarged, translated from the German, with the special permission of the author, by Moritz Müller, _plates_, 8vo, cloth 12 6

Ventilation.

Health and Comfort in House Building, or Ventilation with Warm Air by Self-Acting Suction Power, with Review of the mode of Calculating the Draught in Hot-Air Flues, and with some actual Experiments, by J. Drysdale, M.D., and J. W. Hayward, M.D., second edition, with Supplement, demy 8vo, _with plates_, cloth 7 6

The Supplement separate 0 6

Weight of Iron.

Tabulated Weights of Angle, T, Bulb, and Flat Iron, for the use of Naval Architects and Shipbuilders, by Charles H. Jordan, M.I.N.A., 18mo, sewed, second edition 1 6

Wood-working Factories.

On the Arrangement, Care, and Operation of Wood-working Factories and Machinery, forming a complete Operator's Handbook, by J. Richards, Mechanical Engineer, _woodcuts_, crown 8vo, cloth 5 0

Wood-working Machines.

A Treatise on the Construction and Operation of Wood-working Machines, including a History of the Origin and Progress and Manufacture of Wood-working Machinery, by J. Richards, Mechanical Engineer, _25 folding plates, and nearly 100 full-page illustrations_ of English, French, and American Wood-working Machines in modern use, selected from the designs of prominent Engineers, 4to, cloth £1 5 0

Workshop Receipts.

Workshop Receipts for the use of Manufacturers, Mechanics, and Scientific Amateurs, by Ernest Spon, crown 8vo, cloth 5 0

Royal 8vo, cloth, 7_s._ 6_d._

_Spons' Engineers' and Contractors' Illustrated_

_Book of Prices of Machines, Tools, Ironwork, and Contractors' Material. 1876._

E. & F. N. SPON: LONDON AND NEW YORK.

* * * * *

Transcriber's notes:

Punctuation has been standardized after careful comparison with other occurrences within the text and consultation of external sources. Inconsistencies in spelling and word usage have been retained except as follows:

Pg vii: 1) added "P" to "(P)AGE". 2) ARRANGEMNET altered to ARRANGEMENT.

Pg 5: deserve altered to deserves. "These few words contain a truth which deserves"

Pg 12: has altered to have. "It is to be regretted that there have not been books"

Helmotz altered to Helmholtz.

Pg 47: counter shafts altered to countershafts. "intermediate or countershafts, the expense"

Pg 57: breaks altered to brakes. "to operate railway brakes?"

Pg 59: separated altered to separate "The employment of magnetic machines to separate iron and brass filings or shop waste"

Pg 60: (4.) was retained as the question seems to be included after (3.)

Pg 62: breaks altered to brakes "operated by friction brakes"

Pg 64: kind altered to kinds "in high buildings for most kinds of manufacture"

Pg 97: preventing altered to prevent "to prevent the springing of castings."

Pg 100: Number of Question (8.) was missing. Questions renumbered according to the other blocks of questions.

Pg 120: adapation altered to adaptation. "but they are by such adaptation unfitted for general purposes."

Pg 151: does altered to do "In what way do standard dimensions"

Pg 170: han altered to hand "purely matters of hand skill"

Catalog:

Pg 14: solvlng altered to solving