Six lectures on light : delivered in America in 1872-1878 (1886)
Tyndall, John, 1820-1893 · New York : D. Appleton · leaf 169
ngthen and shorten in quick succession. Its two ends,therefore, are in a state of quick vibration ; but at thecentre the pulses from the two ends alternately meetand retreat from each other. Between their opposingactions, the glass at the centre is kept motionless ;but, on the other hand, it is… … rr. ACTION OF SONOROUS VIBRATIONS. 139 pulse was illustrated in our second lecture. By a simplemechanical contrivance the spots are made to vibrate toand fro : the terminal dots have the largest amplitudeof vibration, while those at the centre are alternatelycrowded together and drawn asunder, the…
Light
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
