Category: Science - Earth/Agricultural/Farming
Let us go to Crayford, near Erith, or to Ilford, in Essex, and take a superficial glance at some of the brickyards found at those places; in particular, let us ascertain a little concerning the earths employed. We find in one brickyard a series of stiff brown or bluish clays,...
In this chapter we shall fulfil our promise (_ante_ p. 58) to explain in an elementary manner the precise meaning of ordinary commercial chemical analyses of some typical earths...
7. CHAPTER VII.It is not our intention to write an elementary treatise on chemistry; but we know it is the custom for brickmakers to have chemical analyses of their raw earths made, and we are...
10. CHAPTER X.This is one of the most important parts of our subject, and it may be approached from several points of view. When a brick decays, its structure, for the most part, is responsib...
1. CHAPTER I.Let us go to Crayford, near Erith, or to Ilford, in Essex, and take a superficial glance at some of the brickyards found at those places; in particular, let us ascertain a littl...
15. CHAPTER XV._Abrasion._--In this country it is not customary to test bricks and stone by means of the abrasion process, though many English materials have been dealt with in this manner on...
4. CHAPTER IV.There cannot be any question that the applicability or otherwise, of an earth for making good bricks, to a large extent depends on the mineral constitution of that earth. A chem...
14. CHAPTER XIV.A very great deal is known concerning the strength of bricks. In addition to the innumerable experiments carried out by public bodies, we have the results of painstaking investi...
5. CHAPTER V.Silica, the oxide of silicon, is found in brickmaking clays principally in two conditions when not combined with other substances: in one of these the free silica may be crystal...
9. CHAPTER IX.Of the merely mechanical aspects of the operations of drying and burning bricks, we shall say little or nothing. But there are just a few points of a more or less scientific nat...
11. CHAPTER XI.The reader may be tempted to enquire, What is the use of knowing the micro-structure of a brick? We have anticipated the question to some extent in dealing with the structure of...
6. CHAPTER VI.Carbonate of lime may occur in a crystalline form, or as earthy substances, and many varieties of it are found in clays used by the brickmaker. The commonest are calcite, aragon...
3. CHAPTER III.Turning to brick-earths of marine origin, we may say that these constitute by far the largest class of deposits from which bricks are made in this country, and it will be useful...
2. CHAPTER II.The great variability of brick-earths deposited in river valleys is reflected to some extent in those laid down in lakes, though the size of the latter is frequently a controlli...
13. CHAPTER XIII.The advantage of knowing the relative absorptive capacity of bricks has been stated in these pages in divers connexions. The means of arriving at the total capacity for absorpti...
12. CHAPTER XII.Turning now to the actual appearance of minerals commonly found in bricks as they are examined under the microscope, we may remind the reader, that the physical aspect of the ma...