. Graphical and mechanical computation . 360° X. Fig. 946. referenfie Fig. 94c. The Westinghouse harmonic analyzer.—This machine, constructedby the Westinghouse Electric and Mfg. Co., is particularly useful in Art. 94 MECHANICAL EVALUATION OF THE COEFFICIENTS 205 analyzing the alternating voltage and current curves represented by apolar or circular oscillogram. Fig. 946 gives one period of a periodic curve drawn on rectangularcoordinate paper. In Fig. 94c, the same curve is represented on polarcoordinate paper. This is done by constructing a circle of any convenientradius, called the zero line
. Graphical and mechanical computation . 360° X. Fig. 946. referenfie Fig. 94c. The Westinghouse harmonic analyzer.—This machine, constructedby the Westinghouse Electric and Mfg. Co., is particularly useful in Art. 94 MECHANICAL EVALUATION OF THE COEFFICIENTS 205 analyzing the alternating voltage and current curves represented by apolar or circular oscillogram. Fig. 946 gives one period of a periodic curve drawn on rectangularcoordinate paper. In Fig. 94c, the same curve is represented on polarcoordinate paper. This is done by constructing a circle of any convenientradius, called the zero line or reference circle and locating any point Pby the angle 6 = x and the radial distance r = y from the zero line. Thusthe points marked P, A, and B in Figs. 946 and 94c are correspondingpoints. If only the odd harmonics are present, the second half-periodof the curve in Fig. 946 will be a repetition below the x-axis of the firsthalf-period; in this case, the diameters at all angles of the curve in Fig. 94cwill be equal, and equal to the diame
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