Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 27
has been found so eminentlysatisfactory in the larger model, hasbeen employed in this model. For operating the comparison lampa single small cell or storage batterygives the most constant results ; but,where preferable, two dry cells, whichthe operator carries suspended on astrap over his shoulder,… … Fig. 3.—Plan of small model P.—Keversible tube bearing test plate anddiaphragm.T.—Elbow tube.G. and G.—Absorbing screens.S.—Photometric device.D.—Diffusing glass. the eye-piece in the ordinary way.The field which is seen looks like theordinary Lummer-Brodhun field. Theelbow tube carrying the…
Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
