Key points are not available for this paper at this time.
II. Experimental tests of galvanometer coils 424 1. The form of the coil 424 2. The standard coils 426 3. Method of comparison of various coils 428 4. Discussion of the results of tests on various coils 428 III. Comparison of astatic magnet systems 431 IV. Test of shielding against magnetic disturbances 432 V. Test of a vacuum galvanometer 438 VI. Summary 443 Appendix.-Note I. Mounting for vacuum thermopiles 444 Bulletin of the Bureau of Standards [va. 13
W. W. Coblentz (1916) studied this question.