Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 266
is faced with blackened wood.The targets are situated in a chamber,about twenty feet long and seventeenfeet wide, of which the walls are finishedwith a pale yellow distemper. Betweenthe firing-point and the partition thereare two glazed roof lanterns, the glass conical reflectors, and L^ indicates… … Fig. 4.—Range at H.M. Patent Office, London- A=Brown millboard. B=Green baize. .C=White card. T =Targets. Li=25 c.p. lamp. L-=65 and 100 c.p. lamps. 260 THE ILLUMINATING ENGINEER (june) each, and the two inner ones are of 100candle-power. The lamps, L, contributeonly a small amount to the target…
Lighting
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