The magnetization of cobalt as a function of the temperature and the determination of its intrinsic magnetic field . n helix was a clear quartz tube. Thehelix was of bare platinum wire wound in two layers separated fromeach other by mica. The individual turns were separated from eachother by asbestos yarn. Though the insulating power of this brokedown quite considerably above 1000°C, actual tests showed that thisdid not introduce any appreciable error. The heating coils were separated from the helix by atube of fused silica. Since nickel loses its magnetic propertiesabove 360°0, it was used fo
The magnetization of cobalt as a function of the temperature and the determination of its intrinsic magnetic field . n helix was a clear quartz tube. Thehelix was of bare platinum wire wound in two layers separated fromeach other by mica. The individual turns were separated from eachother by asbestos yarn. Though the insulating power of this brokedown quite considerably above 1000°C, actual tests showed that thisdid not introduce any appreciable error. The heating coils were separated from the helix by atube of fused silica. Since nickel loses its magnetic propertiesabove 360°0, it was used for the heating coils. The primary heat-ing coil was in two layers. Asbestos yarn was used to separatethe individual turns, while the layers were insulated from eachother by mica. The secondary heating coil consisted of one layerand was wound as in the other apparatus. Calcined magnesia contained in a porcelain ring was usedas a heat insulator next to the coils. Outside of this, a layerof magnesia packing such as is used for high pressure steam pipeswas used. The whole apparatus was covered with asbestos a si *i 51 h 7 e> si >olcm. figure 4 S, Induction helix S2 Fused Silica Tube H, Primary heating Coil h,, Secondary heating Coil M Mica Insulation A Asbestos Board P Pore el am Ring Q Quartz Tube X Galvanometer Circuit - 19 - It is shown in section in Figure 4* The dimensions of the coilsare given in Table I. Table I. - * - Apparatus for the Lower Temperatures,Induction helix. No. 30 bare copper wire wound on a glass tube. Total number of turns £9. Total length of coil 4 cm. Turns per cm. Outside diameter of glass tube - mean of 10 readings - 0.#790cra Outside diameter of coil - mean of 5 readings - cm. Mean diameter of coil heating coil. 22 turnB of No. 16 german silver wire. Total length 3*# heating coil. 12 turns of No. 16 german silver wire. Total length 3«# for magnetic field due to heating circuits w
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Keywords: ., bookcentury1900, bookdecade1910, bookidmagneti, booksubjecttheses
