Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 244
Fig. 1.—Night photograph, showing semi-indirect gas lighting in the Cathedralof SS. Peter and Paul, Philadelphia ; looking towards the main altar. … Fig. 2.—Another view allowing llic efkclivc side-lighling of Uie Catiicdral. 234 THE ILLmilNATlNG ENGINEER (july 1916) PETROL AIR GAS FOR COUNTRYLABORATORIES. A note on. this subject appeared in ourlast issue, and we have now receivedparticulars of another system, the Willett Light, which we…
Lighting
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