Scientific Instrument – Measuring magnetic field produced by an electrical current against the Earth’s magnetic field (compass) – Flemings Right Hand Rule etc – likely Philip Harris c 1930.

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Scientific Instrument – Measuring magnetic field produced by an electrical current against the Earth’s magnetic field (compass) – Flemings Right Hand Rule etc – likely Philip Harris c 1930.

Short Description

Nicely made pine / mahogany box with removeable glass lid; back wall hinges down. Inside we have a good sensitive compass and two sets of parallel wires which are internally connected to the two brass terminals on the front wall. We say likely Philip Harris of Birmingham England, it is not marked, but it sure looks like their reliable work to us. 11cm by 11cm 4 cm deep – very good condition

The application of various levels of current will provide a changing level of deflection in the compass. This will vary also as the instrument is revolved around the compass line. i.e. the true reading is gained with the parallel wires lined up North / south with the compass. There will be zero deflection at 90 degrees to that. Of course the instrument can be used to measure current in reverse principle – see out notes on the tangent galvanometer.

The maths involved is pretty straight forward and very enlightening for anyone who has missed the physics challenge at school or for an interested youngster about to embark on it.

Flemings Right Hand Rule proves very reliable

SO SORRY SOLD

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