London's Pulse: Medical Officer of Health reports 1848-1972

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Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London

Poplar 1906

[Report of the Medical Officer of Health for Poplar, Metropolitan Borough]

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Fig. 3. Electrical Power Switchboard in Situ.
At top are the voltmeter and ammeter, in the centre the unit meter, and the
switch handle below. On the right is the Rheostat or current regulator.