Coils are made of best quality copper wire and paraffin wax insulation is provided thoughout. Fitted with platinum contacts, complete with removable spark dischargers. Coil up to 25mm are workable on 4-6 volts D.C. at 3 Amps. & rest on 6-12 volts D.C. at 5Amps.,
Spark : 10mm 15mm 20mm 25mm
Spark : 50mm 75mm 100mm 150mm

25mm spark, workable on 220volts AC mains, fitted on nicely polished wooden base, complete with cord and plug.

Sensitive, for Kohlrausch conductivity bridge.

7.5cm dia ring with primary 200 turns and secondary 50 turns, mounted on board with independent terminals.

Workable on 220volts A.C. mains, mounted on wooden box with build in transformer, provided with working instructions and tape with stand.

A. Tape
B. Stand for tape.

For use with flux motion, in 3 common ranges.

With soft iron core, mounted on metal stand with terminals.

20 turns per cm with soft iron core size 50x2 cm mounted on teak wood base.