VOL.8,NO. 10
ELECTRIC METRONOME
2061
ELECTRIC METRONOME In an experiment conducted by the laboratory class as a whole i t was necessary that some audible time signal be given regularly so that temperature readings could be taken a t intervals of one minute. By robbing some of the electric impulse which came into the laboratory clock and putting i t into the "line" side of a telegraph relay we were thus able t o operate a local circuit containing a bell and a dry cell so that the desired signal was given. Incidentally, no change in the time of the accustomed "passing" bell was noticed as a result of this tampering.
