The page describes the necessity of having thin, round sheets of metal, like tin or copper, with various openings to work with glass. It details a machine resembling a box, illustrating its dimensions, structure, and the mechanism of how glass or paper is positioned and used with it. Additional features of the machine, such as slats for supporting a painted canvas, are also explained.
Drawing.
From all these observations, it is necessary to have several pieces of tinplate or thin copper, which are round, of the size of the glass, and pierced differently, so as to be able to give thus the glass the opening needed.
One could also make different openings in a copper plate that would slide over the glass, or use a round plate that, turning on its center, would successively let different sized holes pass over the glass.
IX.
Description of the second machine.
28. This second machine is a kind of box (fig. 3), whose width BD and height AB are equal, each about 18 inches; its width FB is only ten: the side EF is sloped, so AE is around six inches.
29. A frame G slides at the bottom of this box, to which the paper is attached. (14.)
30. In the middle of the top of the box, there is an opening with a nut, to raise and lower the cylinder in which the glass is placed. (8.)
31. Inside the top of the box, there are two slats HI, LM, which slide in small irons, similar to those mentioned earlier (7). These slats extend about two feet out of the box, and their ends IM are at a distance from each other equal to, or a bit greater than, the length of the box. They serve to support a canvas painted black, which is attached on the three sides BA, AC, CD of the box's opening.
Translation Notes:
- "Boîte" refers to a type of container or box.
- "Écrou" refers to a nut, a type of fastening device.