Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 66
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… … 30 40 Candlepower In Hundreds. DIAGRAM C.—Liiiht Values for Later Aerial Lighthouse!,
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