Provide a substantially uniform field at the centre space. Each coil has a moulded plastic former 152 mm in diameter with 320 turns of 22 SWG, enamelled wire giving a mean diameter of 136 mm..
The rod has a sliding boss which locks into the tapered hole in the universal stand. Dimensions of Coil & support rod 305 x 152 x 25 mm. Supplied with instructions.