Identifier: sen134234461916282282unse (find matches)
Title: Sensitivity and magnetic shielding tests of a Thomson galvanometer for use in radiometry
Year: 1916 (1910s)
Authors:
Subjects: measurements and use of instruments Condensed matter electronic structure, electrical, magnetic, and optical properties
Publisher: National Bureau of Standards
Contributing Library: NIST Research Library
Digitizing Sponsor: NIST Research Library

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Fig -Form of the coil -when using differentmandrels in Bureau of Standards, Vol. 13
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Cobientz) Experimental Tests on Thomson Galvanometers 427 and one in the upper position, as shown in Fig. 2. The coil whichwas to be compared was mounted at a fixed distance opposite theupper standard coil. The object of the three standard coils wasto enable one to test the symmetry of the deflections of the sus-pended magnet system, which might be affected in mounting thevarious coils which were being tested. Lead wires from each coil,or sections of a coil, were connected with small mercury cups in ablock of paraffin. By this means it was possible to send an electriccurrent through any coil in the instrument. After mounting acoil for comparison the iron shields were put in place and the mag-net system was astatized to give a single swing of two to threeseconds. The symmetry of the deflections produced by the threestandard coils was not affected by slight changes in level. It wastherefore assumed that the coils under examination were beingintercompared with considerable accuracy. The

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