(Plug in type) The heavy brass contact blocks are bond to
the vulcanite plated by the double nut system. The plugs and
lugs are cut to a fine taper and are interchangeable. The
plug heads are machine moulded of bakelite. Each resister
independently mounted with double leads. Accuracy of constantan
coils. 1 % for lower values and .5 per cent for the higher
values. Resistor: The best imported constantan wire is wound
on ebonite spools, the method adopted is no,-inductive and
no magnetic. Each resistor is dipped in boiling hot wax.
As above with 3 ratio coils of 1000, 100 and 10 ohms. Rheostat
arm 1.5000 ohms. Two tapping key with silver contact provided
for battery and galvanometers in teakwood case with hinged
lid, overall dimensions 280 x 200 x 175 mm high.