Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 593
me has to be washed off, thepits in the metal ground away andfinally a high polish added. Most of thiswork is done with rotating wheels usingvarious grinding and polishing materials, iiiid ;i variety of these is used. Alto-gether one received an impression thaithe process of cleaning up of old… … A view of part of one <>f the photometric laboratories at the works of the Edison & SwanUnited Electric Light Co. (Penders Bod, London. N.i A lamp mounted in In- rotating lamp holder is being compared with one of thelarge bulb standards. The eye-piece of the Lummer-Brodhurj photometer…
Lighting
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