Part 1. Introduction and the Principles of Geometry. Part 2. Land

Surveying; comprising General Observations--The Chain--Offsets Surveying by the Chain only--Surveying Hilly Ground--To Survey an Estate or Parish by the Chain only--Surveying with the Theodolite--Mining and Town Surveying--Railroad Surveying--Mapping--Division and Laying out of Land--Observations on Enclosures--Plane Trigonometry. Part 3. Levelling--Simple and Compound Levelling--The Level Book--Parliamentary Plan and Section--Levelling with a Theodolite--Gradients--Wooden Curves--To Lay out a Railway Curve--Setting out Widths. Part 4. Calculating Quantities generally for Estimates--Cuttings and Embankments--Tunnels--Brickwork--Ironwork--Timber Measuring. Part 5. Description and Use of Instruments in Surveying and Plotting--The Improved Dumpy Level--Troughton’s Level--The Prismatic Compass--Proportional Compass--Box Sextant--Vernier--Pantagraph--Merrett’s Improved Quadrant--Improved Computation Scale--The Diagonal Scale--Straight Edge and Sector. Part 6. Logarithms of Numbers--Logarithmic Sines and Co-Sines, Tangents and Co-Tangents--Natural Sines and Co-Sines--Tables for Earthwork, for Setting out Curves, and for various Calculations, etc., etc., etc.

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_Saws: the History, Development, Action, Classification, and Comparison of Saws of all kinds._ By ROBERT GRIMSHAW. With 220 _illustrations_, 4to cloth, 12_s._ 6_d._

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_A Guide for the Electric Testing of Telegraph Cables._ By Capt. V. HOSKIŒR, Royal Danish Engineers. With _illustrations_. Second edition, crown 8vo, cloth, 4_s._ 6_d._

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_Laying and Repairing Electric Telegraph Cables._ By Capt. V. HOSKIŒR, Royal Danish Engineers. Crown 8vo, cloth, 3_s._ 6_d._

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_A Pocket-Book of Practical Rules for the Proportions of Modern Engines and Boilers for Land and Marine purposes._ By N. P. BURGH. Seventh edition, royal 32mo, roan, 4_s._ 6_d._

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.

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_Table of Logarithms of the Natural Numbers, from_ 1 to 108,000. By CHARLES BABBAGE, Esq., M.A. Stereotyped edition, royal 8vo, cloth, 7_s._ 6_d._

To ensure the correctness of these Tables of Logarithms, they were compared with Callett’s, Vega’s, Hutton’s, Briggs’, Gardiner’s, and Taylor’s Tables of Logarithms, and carefully read by nine different readers; and further, to remove any possibility of an error remaining, the stereotyped sheets were hung up in the Hall at Cambridge University, and a reward offered to anyone who could find an inaccuracy. So correct are these Tables, that since their first issue in 1827 no error has been discovered.

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_The Steam Engine considered as a Heat Engine_: a Treatise on the Theory of the Steam Engine, illustrated by Diagrams, Tables, and Examples from Practice. By JAS. H. COTTERILL, M.A., Professor of Applied Mechanics in the Royal Naval College, 8vo, cloth, 12_s._ 6_d._

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_The Practice of Hand Turning in Wood, Ivory, Shell, etc._, with Instruction for Turning such Work in Metal as maybe required in the Practice of Turning in Wood, Ivory, etc., also an Appendix on Ornamental Turning. (A book for beginners). By FRANCIS CAMPIN. Second edition, _with wood engravings_, crown 8vo, cloth, 6_s._

CONTENTS:

On Lathes--Turning Tools--Turning Wood--Drilling--Screw Cutting--Miscellaneous Apparatus and Processes--Turning Particular Forms--Staining--Polishing--Spinning Metals--Materials--Ornamental Turning, etc.

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_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_s._ 6_d._

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_Treatise on Watchwork, Past and Present._ By the Rev. H. L. NELTHROPP, M.A., F.S.A. _Numerous illustrations_, crown 8vo, cloth, 6_s._ 6_d._

CONTENTS:

Definitions of Words and Terms used in Watchwork--Tools--Time--Historical Summary--On Calculations of the Numbers for Wheels and Pinions; their Proportional Sizes, Trains, etc.--Of Dial Wheels, or Motion Work--Length of Time of Going without Winding up--The Verge--The Horizontal--The Duplex--The Lever--The Chronometer--Repeating Watches--Keyless Watches--The Pendulum, or Spiral Spring--Compensation--Jewelling of Pivot Holes--Clerkenwell--Fallacies of the Trade--Incapacity of Workmen--How to Choose and Use a Watch, etc.

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_Now in Course of Publication._

To be completed in about 30 Monthly Parts, each Part containing 64 pp., with _numerous illustrations_, super-royal 8vo, price 2_s._; or in 5 Divisions, cloth, price 13_s._ 6_d._ each.

DIVISIONS I., II, & III., NOW READY.

SPONS’ ENCYCLOPÆDIA OF THE INDUSTRIAL ARTS, MANUFACTURES, AND COMMERCIAL PRODUCTS.

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_Now in Course of Publication._

To be completed in about 18 Monthly Parts, each Part containing 64 pp., with _numerous illustrations_, super-royal 8vo, price 2_s._; or in 3 Divisions, cloth, price 13_s._ 6_d._ each.

DIVISIONS I. AND II. NOW READY.

A SUPPLEMENT TO SPONS’ DICTIONARY OF ENGINEERING,

Civil, Mechanical, Military, and Naval.

EDITED BY ERNEST SPON, MEMB. SOC. ENGINEERS.

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London: E. & F. N. SPON, 16, Charing Cross. New York: 446, Broome Street.