The absolute measurement of inductance . Fig. 4.—Current in condenser due to electromotive force of fig. 3. These quotients show how much smaller relatively the third, fifth,and seventh harmonics are in the inductive current curve than in theelectromotive force curve. Therefore the third, fifth, and seventhharmonics in the current curve may be found by dividing the corre-sponding harmonics in the electromotive force curve by the , , , respectively. Small errors due to the curve itself orto the analysis are thus divided by these factors, and the values of theharmonics found a
The absolute measurement of inductance . Fig. 4.—Current in condenser due to electromotive force of fig. 3. These quotients show how much smaller relatively the third, fifth,and seventh harmonics are in the inductive current curve than in theelectromotive force curve. Therefore the third, fifth, and seventhharmonics in the current curve may be found by dividing the corre-sponding harmonics in the electromotive force curve by the , , , respectively. Small errors due to the curve itself orto the analysis are thus divided by these factors, and the values of theharmonics found are therefore more accurate and more consistent thanif determined directly by analyzing the current curve. ROSA,GROYER ] ABSOLUTE MEASUREMENT OF INDUCTANCE. 135 This process may indeed be carried another step by placing a con-denser in parallel with the circuit AB (7, so that the alternating currentflowing into it will be due to the same electromotive force that causes. Fig. 5. the current in the circuit ABC. In the condenser current, however,the harmonics are magnified in proportion to their order, the seventhharmonic in the condenser current being seven times as great, in pro- 136 BULLETIN OF THE BUREAU OF STANDARDS. [, no. 2. portion to the fundamental, as in the electromotive force, and hence7 X or times as great as in the current through 4 shows the current in a condenser due to such an electromotive
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