Category: Science - Earth/Agricultural/Farming
The chief uses of clay have been recognized since the earliest periods of civilization; the ancient Assyrian and Egyptian records contain numerous references to the employment of clay for the manufacture of bricks and for fulling or whitening cloth.
The chief uses of clay have been recognized since the earliest periods of civilization; the ancient Assyrian and Egyptian records contain numerous references to the employment o...
2. CHAPTER IIClay, as already mentioned, is geologically a rock and not a mineral, and belongs to the important group of sedimentary rocks which have been derived from the igneous or primary...
3. CHAPTER IIIThe terms 'primary' and 'residual' are applied to those clays which are found overlying or in close association with the rocks from which they have been derived, and distinguish...
4. CHAPTER IVFrom whatever sources clays may have been originally derived, the manner in which they have been accumulated in their present positions is a factor of great importance both in r...
5. CHAPTER VAlthough clays occur in deposits of almost all geological periods, many of them are of little or no commercial value. This may be due to their situation or to their composition...
6. CHAPTER VIHaving indicated the origin, modes of accumulation and general characteristics of the numerous materials known as 'clay,' it now remains to ascertain what substance, if any, is...