Music and the Making of Modern Science

208 Chapter 13

A

B

Figure 13.8

Illustrations from Faraday ’ s 1831 paper “ On a Peculiar Class of Acoustical Figures, ” showing the build-up of

heaps of particles blocked by various paper-card obstacles; × shows where the violin bow excites the plate.

Figure 13.9

(a) Faraday ’ s 1831 illustration of the pattern formed by lycopodium powder on a vibrating glass plate, supported

by bridges or strings at the two vertical lines shown. (b) Faraday ’ s illustration of the lines of force of a bar

magnet, as made visible by iron filings.