CAMPBELL VIBRATION TYPE No 106 MIRROR GALVANOMETER of 1912
Mirror galvanometers were used extensively in scientific instruments before reliable, stable electronic amplifiers were available. The most common uses were as recording equipment for seismometers and submarine cables used for telegraphy.
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This model made by the Cambridge and Paul instrument Co has a mirror suspended from two threads instead of one. And is known as a Bi-filar type. Originally conceived by Albert Campbell. See the history above.
In December 1919 the Cambridge Scientific Instrument Company took over the smaller but successful Robert W. Paul(1869-1943) Instrument Company and became The Cambridge and Paul Instrument Company Ltd.