Description
The plastic ring or bobbin,162.5 mm
overall diameter wound with three
coils of insulated copper wire with
2, 50 and 500 turns mounted on
bakelite moulded platform fitted with
4 terminals, rotating on a tripod nonmagnetic metal base, supported by
levelling screws.
Complete with compass box
(Magnetometer) mounted at the
centre of the ring.
SP4-0926
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