For studying magnetic induction properties produced by electric current and the effect of an iron core, etc. Consists of a plastic spool with windings of enamelled copper wire having brass binding posts on square end supports.

Includes a soft iron core rod of diameter 18cm and instructions.

Dimensions:
The coil has about 400 turns of insulated wire gage 19.
Coil: I.D.=25mm, O.D.=31mm, Length=127mm.
Spool: Length=140mm, I.D.=19mm, O.D.=22mm, Flange= Square 63mm x 63mm.
Iron Core: Length=177mm, Diameter=18mm. 
Total Weight = 700 grams.