Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 221
Acton. From an artificial light photograph. Note the entire absence of visible fittings. church, the units being then out of view.The value of the illuinination at the topof the pews is given as 2.5—3 foot-candles. Special luiits are also providedfor lighting the vicars stall and theBook on the… … Holdfast Lamp Guard. well adapted to protect lamps from shockand vibration. The wire cage terminatesin a clamping collar lock which forms a per-manent and rigid guard to the socket,and there is also a ring of spiral wirewhich supports the lower part of the bulb,and helps in preventing breakage…
Lighting
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