RESISTANCE COIL

* The coil is wound non-inductively with insulated constantan wire and
* enclosed in a transparent cylindrical cover with
* square molded ends of either black or red or Yellow plastic.
A) Perspex
Having tansparent Body with Brass terminals both sides & wounded on coil clearly visible
B) Bakelite case
the coil is fitted in round bakelite box 2 inches round & having two Brass/bakelite terminals
C) Wooden case
the coil is fitted in wooden box having sizes 3" x 2" aprox having Bakelite plate on it with two brass terminals