The velocity of sound waves having a frequency of 107,500 cycles per second has been measured in water vapor and in ether vapor. The waves are generated by a quartz crystal oscillator and velocities measured by an interference method similar to that used by Pierce. The sound chamber is made air tight. After thorough exhaustion of the chamber with an air pump the vapor is introduced through a stop cock which connects the chamber with a glass bottle containing vapor. The sliding joint, through which the rod carrying the sound reflector passes, is made air tight by means of a rubber tube, which, by stretching and contracting, allows the reflector to be moved back and forth by a screw mounted outside the chamber.
Proceedings of the Iowa Academy of Science
©1930 Iowa Academy of Science, Inc.
Thompson, George E.
"Velocity of Ultra-Sonic Waves in Vapor,"
Proceedings of the Iowa Academy of Science, 37(1), 314-315.
Available at: https://scholarworks.uni.edu/pias/vol37/iss1/84