he effects are much more beautiful, and have been utilised in forming some of the best patterns used for carpet-weaving and other things. Sir David Brewster intended to take out a patent for this instrument ; but before he was able to secure it, the opticians heard of it, and made some and sold… … The proper construction of the instrument is shewn in the figure : two pieces of glass run from A to B, being wider at B than at A, and joining nicely where they meet at the bottom. The backs of them must either be silvered or blackened, and the top of the case between the pieces of glass must be…
Light · Color · Optical illusions · Optics
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
