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Description: | Low frequency AC measurement. Contained in a mu-metal screen (to reduce interference by electromagnetic fields); mounted in a rectangular wooden box with integral optical system. Frequency can be altered from 24 Hz - 110 Hz by applying a current of 5 mA to 400 mA to a field coil. With 2 black knobs for fine and coarse tuning and 4 steel terminals. | License: | http://www.abdn.ac.uk/historic/Copyright_terms_conditions.shtml | Publisher: | ABDNP University of Aberdeen, Natural Philosophy Collection of Historical Scientific Instruments | Rights holder: | 47718 | Source: | University of Aberdeen | Creator: | H. Tinsley & Co. Ltd. / London S.E. 25 | Identifier: | http://calms.abdn.ac.uk/Geology/dserve.e... | Go to resource |
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A.C. current frequency generator (probable…
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