Electric metronome - Journal of Chemical Education (ACS Publications)

J. Chem. Educ. , 1931, 8 (10), p 2061. DOI: 10.1021/ed008p2061.1. Publication Date: October 1931. Note: In lieu of an abstract, this is the article's ...
0 downloads 0 Views 149KB Size
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.