Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 322
SHORT NOTES ON ILLUMINATING ENGINEERING. ILLUMINATION OF SIGNS AND BUILDING EXTERIORS BY PROJECTORS. In the Electrical Review and WesternElectrician* an account is given of a newform of flood-light type of lightingunit which is being used in the UnitedStates for illuminating the outsides… … This projector consists of a highlypolished aluminium parabolic projector16 in. in diameter and mounted in aniron frame. The front is covered withcurved heat-resisting glass. A 500 wattfocus type gas-filled lamp is mounted * May 29th, 1915. with the filament at the focus of thereflector. In this…
Lighting
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