A light-beam data recorder for determination of the gravitational constant: Anomalous driven oscillations of a gravitation torsion balance

Details A light-beam data recorder for determination of the gravitational constant: Anomalous driven oscillations of a gravitation torsion balance A light-beam data recorder for determination of the gravitational constant: Anomalous driven oscillations of a gravitation torsion balance

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988amjph..56..348d&link_type=abstract

American Journal of Physics, Volume 56, Issue 4, pp. 348-351 (1988).

Physics

3

Laboratory Experiments And Apparatus, Determination Of Fundamental Constants

Scientific paper

A 10-in. potentiometric strip-chart recorder with a broken slidewire is rehabilitated by adding a phototransistor to the pen pointer and a simple circuit supplying error voltage to the null amplifier. The usually important signal input circuits and reference voltage supply are not needed. The modified recorder pointer follows the light beam reflected onto the chart from a gravitational balance to produce an exact timed tracing of balance deflections. A simple addition provides automatic resetting of the pointer after beam interruption or power failure. Thus gravitational constant experiments are made much more accessible to undergraduates. The modified recorder also has other uses. But, most unexpectedly, it revealed consistent repetitive anomalous driven oscillations of the balance that are not related to its normal damped motion.

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