. Sensitivity and magnetic shielding tests of a Thomson galvanometer for use in radiometry . of two types,producing coils of the formshown in Fig. 1, which showsa compound coil wound inthree sections of graded Xo. 2 was tried todetermine whether a markedimprovement would result inthe magnetic field near thegalvanometer needles. Whenusing fine wires for the innersection of the coil, this formof winding (mandrel No. 2)was found to be the coils to be describedpresently the insulation was asingle layer of silk, exceptingin the coil, which wascovered with a doubl
. Sensitivity and magnetic shielding tests of a Thomson galvanometer for use in radiometry . of two types,producing coils of the formshown in Fig. 1, which showsa compound coil wound inthree sections of graded Xo. 2 was tried todetermine whether a markedimprovement would result inthe magnetic field near thegalvanometer needles. Whenusing fine wires for the innersection of the coil, this formof winding (mandrel No. 2)was found to be the coils to be describedpresently the insulation was asingle layer of silk, exceptingin the coil, which wascovered with a double layer ofsilk. The thickness of the insulation was about mm, whichis practically the same as used by Abbot (loc. cit.). The thick-ness of the various samples of wire, some of which had been pur-chased (from A. F. Moore, Philadelphia) eight years ago, variedfrom to mm. 2. THE STANDARD COILS All the coils investigated were compared with a set of threecoils, which was used as a standard. These three coils weremounted securely in an ironclad support, two in the lower part. Fig -Form of the coil -when using differentmandrels in Bureau of Standards, Vol. 13
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