In the first of these the acceleration due to gravity is measured by timing by means of an electrically driven tuning fork the descent of a small metal ball. The start and finish of the fall are recorded electrically on a rotating drum on which the fork is also making a trace. In the second experiment the average velocity of air molecules is measured by finding the volume per second of the gas emerging from a region of higher pressure (usually atmospheric) into one of low pressure, through a small orifice of measured diameter.
Proceedings of the Iowa Academy of Science
©1937 Iowa Academy of Science, Inc.
Kadesch, W. H.
"Two Experiments for First Year Students of Physics,"
Proceedings of the Iowa Academy of Science, 44(1), 152-152.
Available at: https://scholarworks.uni.edu/pias/vol44/iss1/58