Apparatus consists of a brass tube partitioned into chambers. Partitions contain small holes which are exactly aligned. Gas is introduced at a pressure of several millimeters at one end; a vacuum is maintained in other chambers by rapid pumping and the molecular beam passing through the aligned holes is measured by impact upon a vane suspended from a quartz fiber. Introduction of a gas in one of intermediate chambers deflects away a definite proportion of the beam giving a direct measure of the mean free path.
Proceedings of the Iowa Academy of Science
©1930 Iowa Academy of Science, Inc.
Eldridge, John A.
"Mean Free Path of Gases by a Direct Method,"
Proceedings of the Iowa Academy of Science, 37(1), 315-315.
Available at: https://scholarworks.uni.edu/pias/vol37/iss1/85