Tyndall, John, 1820-1893 · New York : Appleton · leaf 376
ion of the one fork by the other will be the re-sult. It so happens that in the present instance the second OPTICAL ILLUSTRATIONS OF BEATS. 3G: fork adds something to the action of the first, the band oflight being now four feet long. These forks have beentuned as perfectly as possible. Each of… … served during the subsidence of the vibrations oi a singlefork. The band at length dwindles to the original disk,which remains motionless upon the screen. By attaching, with wax, a threepenny-piece to theprong of one of these forks, its rate of vibration is lowered.The phases of the two forks…
Sound
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
