Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 43
Fig. 2.—Typical Fitting. For street lighting such a unit shouldbe very useful. It achieves the resultof securing the desired distribution oflight, so as to illuminate the pavementevenly by altering the direction ofthe rays and without absorbing a con-siderable proportion of the light. At thesame… … Distribution of Light from above unit.Lamp alone Ishown dotted). Lamp with Refractor Lantern (shown fulh IHK ILIA\MIXAri\<! KXCINEEH (jan.) 37 THE ZENDA HIGH PRESSUREPETROLEUM LAMP. Ok late years thr iise of high jjitssure <3illa]iii)s with imaiidescent mantles haseoiisiclerably extended tlie…
Lighting
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