Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 153
/S-»al£> 60 rtata /OO-KatU /SDTfaOj tOO-TY/i/O … SOOYYatfj SOO-Watt, /OOO-Tfhrtj tSOO-nhtUs FlG. 1.—Range of British-made gas-tilled lamps.Scale: 1 to 12.,. unit. The range of sizes available isshown in Fig. 1. Table A gives the de-tailed values for both gas-filled andvacuum type lamps, and illustrates thesubstantial increase in efficiency…
Lighting
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