Abstract
(1) Introduction—The Fourier coefficients obtained from harmonic analysis of observations of periodic or quasi‐periodic phenomena may be conveniently exhibited as points in Euclidean space. As a simple illustration, the 12‐hour oscillations in barometric pressure, which have occurred at any one station on N different days, may be represented both in amplitude and in phase by N points in a plane. This device has been used by Bartels [see 1 and 3 of “References” at end of paper], Chapman (who gave it the name “harmonic dial”), and others, in studying atmospheric tides, magnetic variations, and similar phenomena. As an example, Figure 1 by Bartels is here reproduced [1].
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