Letters on natural magic, addressed to Sir Walter Scott (1832)
Brewster, David, 1781-1868 · London : John Murray · leaf 213
189 K A LEI DO PHONE. and the other two cylindrical ones of different dia- meters. On the extremities of these rods are Ax- Fig. 43. … ed small quicksilvered glass heads, either singly or in groups, so that when the instrument is placed in the light of the sun or in that of a lamp, bright images of the sun or candle are seen reflected on each bead. If any of these rods is set a-vibrating , these luminous images will form…
Scientific recreations · Magic
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
