P.O. Box 3 ratio constantan coil |
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| P.O. Box 3 ratio constantan coil
(1189 ) |
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Consisting of 12 mm thick rectangular brass block, coils are wound with constantan coil having accuracy with ± 0.1%.
The 3 ratio P.O. Box has 16 non-inductively would coils 1,2,2,5,10,20,20,50,100,200,200,500,1000,2000,2000,5000 ohms and two proportional arms each with coils of 10,100,1000 ohms.
The 4 ratio P.O. Box has 16 coils as above and two proportional arms each with coils of 1,10, 100 and 1000 ohms.
Also incorporates infinity gap.
Heavy, superior quality double brass terminals are provided and panel is clearly engraved with the nominal resistance values.
Two spring keys having good contact for battery and galvanometer is also provided.
The whole system is contained in a superior quality teak wood box.
Resistance between 0.1 and 11110000 ohms can be accurately measured using a D.C. Battery.
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