Electronics

From the Philip Harris catalogue, 50th ed. 1950: 7077 Potentiometer, Dial Pattern. This is a simp..

From the Philip Harris catalogue 50th ed. 1950: Potentiometer, Two Metres. Designed by Dr. H...

From the Philip Harris catalogue, 50th ed. 1950: Wheatstone Bridge, One-Metre, similar to No...

Resistance Box by Philip Harris Ltd, Birmingham, with glass sides so that the resistance copils a..

A resistance box or resistor substitution box is a unit containing a number of precision resistor..

A resistance box or resistor substitution box is a unit containing a number of precision resistor..

Values: 1, 2, 2, 5, 10, 20, Inf, 50, 100, 200, 200, 500, 1000, 100, 10, 10, 100, 1000. 2 Morse ke..

A resistance box or resistor substitution box is a unit containing a number of precision resistor..

Resistance Box by Philip Harris Ltd, Birmingham. Resistance values: .1, .2, .2, .5. All keys ..

A mirror galvanometer is a mechanical meter that senses electric current, except that instead of ..

*Note that, while the images show the paper inside the glass frame as slighty pinkish, it is actu..

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