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| POST OFFICE BOX, PLUG TYPE Coils of Constantan Wire
(0387) |
| Plug type, in polished teak wood box with hinged lid and black bakelite panel lined in white colour to show circuit connections. Coils of resistance wire, double silk covered, are wound non-inductively and have a negligible temperature co-efficient. Three pairs of ratio arms are each 10, 100, 10000 and resistance arms contains 16 coils from 1 to 50000 with infinity plug. Total value 11,1100. Two spring keys having special contact for battery and galvanometer fitted. Accuracy of coils 100 to 5000 ? 0.05% and of the resistance coils ? 0.1%. |
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