Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 160
igns. These pro-bably constitute the majority of thedevices sold at the present time, butthe difficulty of any organized testingof such varied and numerous productsseems to have stood in the way of theirinvestigation. There is, without doubt,ample need and room for systematizedwork in this… … Fiii. 1. gave very good results. Tiie preparationof such curves by makers or otiiersclearly must rest upon the availabilityof suitable and rehable apparatus.The thing must be got beyond thelal)oratory stage. The humps referred to by the authorson the curves in Figs. J 2a and 13were evidently due to…
Lighting
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