Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 429
of this principle is so to arrange ourproperly coated sphere that the lamp to be tested may be readilyinserted; to replace a small portion of the sphere by a piece of un-polished white glass; to shut off the direct rays of the lamp to bemeasured from this glass surface; and so to mount a… … Fig. 94. Interior of 80-Inch Integrating Sphere lamp under test. A substitution method is used in practice. Astandardized lamp of the general type of the one to be tested is mount-ed in the sphere and the constant of the instrument for this type oflamp is determined. The unknown lamps are then put…
Electrical engineering
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