This was to be a fine quality of flint-glass, and to it might be added coloring-matter of any desired tint; but in the choice and proportion of this lay one of the principal secrets of the art. ❋ Various (N/A)
The man, dipping his pipe, not into the ruby glass, but into an adjoining pot of fine flint-glass, carefully blew a small globe, and then removing the tube from his mouth swung it about in the air for a few moments, until it had gained a certain degree of firmness. ❋ Various (N/A)
From some experiments of the writer upon the subject, it may be concluded that at the most quartz which has been fused expands only about one-fifth as fast as flint-glass, at all events between 20° and 70° C. § 84. ❋ Richard Threlfall (N/A)
These are all flint-glass, you understand; the principal window-glass factories are in the southern part of New Jersey, and in ❋ Various (N/A)
The Early Works made a specialty of flint-glass crystal, and cut and engraved ware for domestic and ornamental use, also of the finer qualities of shades for lamps and chandeliers. ❋ Fannie E. Newberry (N/A)
At the close of the operation a single drop of white enamel glass is fused round the platinum wire at a high temperature, so as to make a good joint with the protecting flint-glass tube. ❋ Richard Threlfall (N/A)
This flint-glass melts the easiest, and common bottle-glass takes the longest. ❋ Various (N/A)
The flint-glass tube is then fused down upon the platinum wire, care being taken to avoid the presence of air bubbles. ❋ Richard Threlfall (N/A)
For this purpose the flint-glass tube is pulled down till it will just slip over the stem and wire, and is cut off so as to leave about half a centimetre of platinum wire projecting. ❋ Richard Threlfall (N/A)
B. W.G -- the exact size is unimportant -- must be provided, also some sheet aluminium about 1 millimetre thick, some white enamel cement glass, and a "cane" of flint-glass tube of a few millimetres bore. ❋ Richard Threlfall (N/A)
Take a piece of flint-glass, beat it to a fine powder, and grind it well with the white of an egg, and it joins china without riveting, so that no art can break it in the same place. ❋ Daniel Young (N/A)
The largest and most permanent national bodies, however, such as the compositors, the flint-glass makers, miners, and others were formed after 1840; the miners in 1844 numbering 70,000 voting members. ❋ Edward Potts Cheyney (1904)
Towards the close of the eighteenth century a Swiss named Guinand at last succeeded in producing larger flint-glass discs free from striae. ❋ George Forbes (1892)
He soon acquired a great reputation for his telescopes of moderate size; but there was a difficulty in making flint-glass lenses of large size. ❋ George Forbes (1892)
It was found impossible to procure flint-glass, such as was needed for optical use -- that is, of perfectly homogeneous quality -- except in fragments of insignificant size. ❋ Unknown (1874)
A signal improvement in the art of making and working flint-glass thus most opportunely coincided with the rise of a German school of scientific mechanicians, to furnish the instrumental means needed for the reform which was at hand. ❋ Unknown (1874)
He now zealously devoted himself to the improvement of the achromatic telescope; and, after a prolonged study of the theory of lenses, and many toilsome experiments in the manufacture of flint-glass, he succeeded in perfecting, December 12, 1817, an object-glass of exquisite quality and finish, 9-1/2 inches in diameter, and of 14 feet focal length. ❋ Unknown (1874)
Knowing the curvature of the eyeball, it is easy to calculate (as I did in the memoir mentioned above) the curvature of a convex lens of flint-glass that should, when plunged into water, produce effects of an exactly equal and contrary value, exactly neutralizing the effects of the concave eyeglass of water, if it were held immediately in front of the pupil of the eye. ❋ Francis Galton (1866)
If the spectacle-lens be of flint-glass and doubly convex, each of its faces should have a curvature of not greater than 6 1/2 tenths of an inch, nor more than 8 1/2 tenths of an inch in radius: within these limits, it is practicable to obtain perfectly distinct vision under water by pressing the spectacles forwards or backwards to a moderate degree. ❋ Francis Galton (1866)
We have first of all the position (dotted) of the unrefracted beam marked upon the screen; then we produce the narrow water-spectrum (W); finally, by introducing a flint-glass prism, we refract the beam back, until the colour disappears (at A). ❋ John Tyndall (1856)
