[Electric engineering.] . fact, if all the rays were exactlyparallel and the mirrors perfect and if there were no absorp-tion of light by the atmosphere, the intensity of the beamwould not diminish at all. As a matter of fact, it doesdiminish to an extent that depends very largely on thecondition of the atmosphere. For many of the following pointsand illustrations relating to search-lights we are indebted to a paperby Lieut. B. T. Walling publishedin the Proceedings of The UnitedStates Naval Institute. The typeof lamp here described is onedesigned by the General ElectricCompany and which is us
[Electric engineering.] . fact, if all the rays were exactlyparallel and the mirrors perfect and if there were no absorp-tion of light by the atmosphere, the intensity of the beamwould not diminish at all. As a matter of fact, it doesdiminish to an extent that depends very largely on thecondition of the atmosphere. For many of the following pointsand illustrations relating to search-lights we are indebted to a paperby Lieut. B. T. Walling publishedin the Proceedings of The UnitedStates Naval Institute. The typeof lamp here described is onedesigned by the General ElectricCompany and which is used verylargely both for naval and com-mercial work. 105. General Construc-tion.—Fig. 58 shows a 24-inchprojector. The barrel A con-tains the lamp and reflector,the reflector being mounted inthe back end. This barrel isswung on trunnions supportedby the base B and is arrangedso that the projector can be FlG- 58- swung around through any angle. The barrel can also beswung up and down or clamped in any desired position by. y*. ELECTRIC LIGHTING. 18
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