Experimental work has been done by the writer in which a fine beam of electrons was caught in a magnetic field and turned into a spiral. A photographic plate placed across the path was marked by a trace which at first appeared to be a circle. A close examination however showed that the trace was unsymmetrical and that its curvature appeared to change with the length of Arc.
Proceedings of the Iowa Academy of Science
©1923 Iowa Academy of Science, Inc.
Lapp, C. J.
"The Trace Left by a Helical Beam of Electrons on a Plane Perpendicular to Its Axis,"
Proceedings of the Iowa Academy of Science, 30(1), 72-74.
Available at: https://scholarworks.uni.edu/pias/vol30/iss1/14