. Sensitivity and magnetic shielding tests of a Thomson galvanometer for use in radiometry . & MINUTES FiG. 5.—Fluctuation of zero reading of the needle in an ironclad mounting, surroundedwith one cylinder of gas pipe 20 cm in diameter mm. 9 riisiu-rES Fig. 6.—Fluctuation of the zero reading of ironclad galvanometer Xo. 2 when all the shields were in place 436 Bulletin 0} the Bureau of Standards [ measurements when the zero is unsteady. From the behaviorillustrated in Fig. 6 it is evident that ordinary magnetic disturb-ances can be greatly reduced and that the Thomson galvanometercan be
. Sensitivity and magnetic shielding tests of a Thomson galvanometer for use in radiometry . & MINUTES FiG. 5.—Fluctuation of zero reading of the needle in an ironclad mounting, surroundedwith one cylinder of gas pipe 20 cm in diameter mm. 9 riisiu-rES Fig. 6.—Fluctuation of the zero reading of ironclad galvanometer Xo. 2 when all the shields were in place 436 Bulletin 0} the Bureau of Standards [ measurements when the zero is unsteady. From the behaviorillustrated in Fig. 6 it is evident that ordinary magnetic disturb-ances can be greatly reduced and that the Thomson galvanometercan be given a much wider application than has been possible here-tofore. The determination of the numerical value of the shielding wasmade on another ironclad galvanometer which is a duplicate ofXo. 2, just described. The test was made with a single magnet,2 mm long, attached to a glass rod which held also the magnet was suspended in a glass tube provided with a planeglass window. This glass tube rested upon the concrete basewhich supported the galvanometer and shields. The latter were,of course, temporarily removed and the magnet was suspendedat the same height from the support as obtained when it was sus-pended in the iro
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