Each resistor is independently mounted with double leads. Accuracy of Constantan coils 0.1% or lower values & 0.5% for higher values. Resistor: the best imported constantan wire is wound on ebonite spools; the method adopted is non inductive & non magnetic. Each resistor is dipped in boiling hot wax. Provided as above with 3 ratio coils of 1000, 100 & 10 ohms. Rheostat arm 15,000 ohms. Two tapping keys with silver contacts provided for battery & galvanometer in teakwood case with hinged lid. Overall dimensions : 280x200x175mm approx.