Abstract
I took my only formal geophysics course in 1932 at the University of Texas. Arnold Romberg was the teacher. Early in the course, he explained the theory of the horizontal pendulum and showed that theoretically it has an infinite period when its axis of rotation is vertical. It behaves like a sphere on a perfectly horizontal table — i.e., the sphere stays wherever it is put. Romberg also told us that no vertical seismograph had ever been designed with equally good characteristics.
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