It consists of a back
elite moulded ring 170 mm dia, with three sets of winding either 2,50 and
500 turns or 2,5 and 50 turns (depending upon the requirement) respectively,
carefully insulted, connected to heavy brass terminal. The number of turns is
clearly marked between the terminals.
The ring is mounted on a pivoted
round bakelite base which rotates on an aluminum tripod base fitted with three
brass leveling screws, the high sensitive compass box (with permanent magnet)
is mounted on a substantial brass pillar and is free to rotate upon it. The
compass is 5" in dia. and has a scale graduated to single degrees. Overall
height is app. 9", all brass parts are chrome plated.
