P.O. Box- Plug Type (Constantan & Manganin Coil)
i) The 3-Ratio P.O. Box has sixteen 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.
ii) The 4-Ratio P.O. Box has sixteen coils as above and two proportional arms each with coils of 1, 10, 100 and 1000 ohms.
iii) They have also incorporates infinity gap.
iv) Heavy, superior quality double brass terminals are provided and panel is clearly engraved with the nominal resistance values.
v) Two spring keys having good contact for battery and galvanometer is also provided.
vi) The whole system is contained in a superior quality teak wood box. Resistance between 0.1 and 1111000 ohms can be accurately measured using a DC Battery.