Electrical engineer's pocket-book: a hand-book of useful data for electricians and electrical engineers (1901)
Foster, Horatio A. (Horatio Alvah), 1858-1913 · New York, D. Van Nostrand co.; London, E.& F.N. Spon, ltd. · leaf 404
plane on the upright, c. The stand-ard light, S, a benzine lamp, is contained in a lantern fastened to the rigbtend of the tube, A. Within tbe tube, A, a circular plate of opal glass can bemoved from or towards the light, S ; its distance from E is read in centi-meters on the scale, s, by means of… … Fig. 3. is read on the graduated circle, C. A rectangular prism contained in tubeB in its axis of rotation receives light from the opal glass plate in tube A,and reflects this light towards the eye-piece, O, so that the right half of thefield of vision is illuminated by this light, the left half is…
Electrical engineering
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