Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 66
30 40 Candlepower In Hundreds. DIAGRAM C.—Liiiht Values for Later Aerial Lighthouse!, … Fkj. 5.—Pilotage Light by Day, with Aeroplanes in the Background. C 2 >r, THE OXUMINATINC ENGINEER (ran. 1922) district. Diagram E shows the rangecurve for the upper unit of this lightminus the parabolic reflector. Incidentally, it may be remarked thatduring the War a small lighthouse of the500…
Lighting
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