Letters on natural magic, addressed to Sir Walter Scott (1832)
Brewster, David, 1781-1868 · London : John Murray · leaf 217
193 ACOUSTIC FIGURES. If, in place of a solid plate, we strew the sand over a stretched membrane, the sand will form it- . Fig. 46. No. 1. No. 2. No. 3. No. 4. … self into figures, even when the vibrations are com- municated to the membrane through the air. In order to make these experiments, we must stretch a thin sheet of wet paper, such as vegetable paper, over the mouth of a tumbler-glass with a footstalk, and fix it to the edges with glue. When the pa-…
Scientific recreations · Magic
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
