Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 65
ne isilluminated by four lamps similar to thatin the top unit, placed equidistantlyaround the periphery of the apex of thecone and projecting about two feet.The cone is painted with a special light-reflecting composition, and is visibleas a triangular patch of light at adistance of 15 miles. The… … 4.—Pilotage Light at Night. renders it remarkably distinct even whensurrounded by other Hashing lights, thussol vine a difficult problem, that of pro-viding observers untrained in navigationwith a light that is easily distinguishable,when placed in a thickly populated THE ILLUMINATING ENGINEER…
Lighting
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