 | 1840 - 644 pages
...cristal," from its resemblance to real crystal, is composed of silez (whence the English name), to which is added carbonate of potash and litharge, or...owing, not only its great specific gravity, but its snperior lustre, its ductility, and power of refraction. It is necessary for optical purposes that... | |
 | Perry Fairfax Nursey - 1840 - 640 pages
...cristal," from its resemblance to real crystal, is composed of silex (whence the English name), to which is added carbonate of potash and litharge, or red lead ; to which lalter material is owing, not only its great specific gravity, but its superior lustre, its ductility,... | |
 | 1840 - 812 pages
...cristal," from its resemblance to real crystal, — is composed of silex (whence the English name) , to which is added carbonate of potash and litharge, or red lead : to the latter material is owing, not only its great specific gravity, but its superior lustre, ductility,... | |
 | 1840 - 416 pages
...cristal," from its resemblance to real crystal, — is composed of silex (whence the English name), to which is added carbonate of potash and litharge, or red lead : to the latter material is owing, not only its great specific gravity, but its superior lustre, ductility,... | |
 | William Newton - 1841 - 468 pages
...cristal," from its resemblance to real crystal, is composed of silex (whence the English name), to which is added carbonate of potash and litharge, or...caused by the want of homogeneity in the melted mass, occasianed by the difficulty of perfectly fusing substances of sucft different density as the materials... | |
 | William Newton, Charles Frederick Partington - 1841 - 472 pages
...cristal," from its resemblance to real crystal, is composed of silex (whence the English name), to which is added carbonate of potash and litharge, or...caused by the want of homogeneity in the melted mass, occasiVOL. xyn. i" oned by the difficulty of perfectly fusing substances of such different density... | |
 | 1841 - 912 pages
..."crystal," from its resemblance to real crystal, is composed of silex (whence the English name,) to which is added carbonate of potash and litharge, or...distorted, and this defect is caused by the want of homogenity in the melted mass, occasioned by the difficulty of perfectly fusing substances of such... | |
 | 1841 - 466 pages
..."crystal," from its resemblance to real crystal, is composed of silex (whence the English name,) to which is added carbonate of potash and litharge, or...purposes that flint glass should be perfectly free from stria?, otherwise the rays of light passing through it diverge and become distorted, and this defect... | |
 | 1840 - 632 pages
...cristal," from its resemblance to real crystal, is composed of silex (whence the English name), to which is added carbonate of potash and litharge, or...purposes that flint glass should be perfectly free from •true, otherwise the rays of light passing through it direrge and become distorted, and this defect... | |
| |
Flint glass, called by the French " cristal," from its resemblance to real crystal, is composed of silex (whence the English name), to which is added carbonate of potash and litharge, or red lead ; to which latter material is owing, not only its great... 