Various textbooks are not in agreement as to whether the vibrating piston is at a node or "near a node." The theory shows that it is strictly at a node. The misstatement in regard to the location of the piston has probably been caused by a misunderstanding of the word "node.” The piston is one-half wave-length from the nearest node and yet it is strictly not a point of rest.
Proceedings of the Iowa Academy of Science
©1925 Iowa Academy of Science, Inc.
Stewart, G. W.
"The Position of the Vibrating Source in the Kundt's Tube Experiment,"
Proceedings of the Iowa Academy of Science, 32(1), 383-383.
Available at: https://scholarworks.uni.edu/pias/vol32/iss1/88