. A determination of the international ampere in absolute measure. ings in each layer were not uniformly distributed, but inadjacent layers were crowded toward opposite sides of the channel; hot paraffin was paintedon and into each layer. Over each layer a strip of onion-skin paper ( mm thick) soakedin paraffin was pressed down closelywith a hot copper; over the toplayer the coil was sealed like theothers. Thus the windings of thiscoil are embedded in a solid blockof paraffin, and most effectivelyprotected from atmospheric shown in Section III, the failureto distribute the wires
. A determination of the international ampere in absolute measure. ings in each layer were not uniformly distributed, but inadjacent layers were crowded toward opposite sides of the channel; hot paraffin was paintedon and into each layer. Over each layer a strip of onion-skin paper ( mm thick) soakedin paraffin was pressed down closelywith a hot copper; over the toplayer the coil was sealed like theothers. Thus the windings of thiscoil are embedded in a solid blockof paraffin, and most effectivelyprotected from atmospheric shown in Section III, the failureto distribute the wires uniformlyacross the channel was a source ofuncertainty not recognized at thetime. These coils were tested by the magnetometer in the same man-ner as were the fixed coils, and, excepting Mi, were found to bevery good. Mi was much worse than Li, and so was not used inthe later work. The insulation was frequently tested as for the fixed coUs, andalways found to be very high. The results of the direct measurements of the coils will be foundin the appendix, page 4.—Section of moving coil showingthird form of teminal block Connections are made as desired by dropsof solder, A are flanges to secure stiff-ness. B Is channel for the wire 8. THE COOLING SYSTEM As shown in Figs, i and 2, each form on which a fixed coil iswound has back of the slot in which the wire is wound a channel
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernatio, bookyear1912
