...surface of one of these rocks is of a lighter color than the natural rock face or polished surface. The impact of the hammer breaks up the granules on...and the greater the abundance of dark minerals, the greater will be the contrast between hammered and polished surfaces. This is a matter worthy of consideration...

...surface of one of these rocks is of a lighter color than the natural rock face or polished surface. The impact of the hammer breaks up the granules on...and the greater the abundance of dark minerals, the greater will be the contrast between hammered and polished surfaces. This is a matter worthy of consideration...

...surface of one of these rocks is of a lighter color than the natural rock face or polished surface. The impact of the hammer breaks up the granules on...and the greater the abundance of dark minerals, the greater will be the contrast between hammered and polished surfaces. This is a matter worthy of consideration...

...surface of one of these rocks is of a lighter color than the natural rock face or polished surface. The impact of the hammer breaks up the granules on...and the greater the abundance of dark minerals, the greater will be the contrast between hammered and polished surfaces. This is a matter worthy of consideration...

...surface of one of these rocks is of a lighter color than the natural rock face or polished surface. The impact of the hammer breaks up the granules on...and the greater the abundance of dark minerals, the greater will be the contrast between hammered and polished surfaces. This is a matter worthy of consideration...

...merely to the fact that through careful grinding all these irregularities and reflecting surfaces arc removed, the light penetrating the stone is absorbed, and the effect upon the eye is that of a more or loss complete absence of light or darkness. Obviously then the more transparent the feldspars and the...

...absorbed, and the resultant effect upon the eye is that of whiteness. The darker color of a ]K)lished surface is due merely to the fact that, through careful...the effect upon the eye is that of a more or less mmplete absence of light, or darkness. Obviously, then, the more transparent the feldspars and the...

...careful grinding, all these irregularities and reflecting surfaces are removed, the light penetrates the stone, is absorbed, and the effect upon the eye...and the greater the abundance of dark minerals, the greater will be the contrast between hammered and polished surfaces. This is a matter worthy of consideration...

...and their polished surfaces are the physical properties of chief economic importance. Doctor Merrill" explains the cause of these contrasts very satisfactorily...penetrating the stone is absorbed, and the effect u|>on the eye is that of a more or less complete absence of light, or darkness. Obviously, then, the...

...absorbed, and the resultant effect upon the eye is that of whiteness. The darker color of a l>olished surface is due merely to the fact that, through careful...the effect upon the eye is that of a more or less compiete absence of light, or darkness. Obviously, then, the more transparent the feldspars and the...