Hobart, H. M. (Henry Metcalf), 1868-1946 ed · Philadelphia, J. B. Lippincott · leaf 107
and so to contrastthe two illuminations. The theory of thegrease-spot photometer is somewhat complex, 1 ? Fig. 1.—Bnneen Photometer although its construction is simple. (Ref.Photometrical Measurements, Stine, p. 62.) Lummer-Brodhun Photometer Head,a photometer head devised by ProfessorsLummer and… … Fig. 2.—Lnmmer-Brodhun Photometer Head. Diagram otLight Path the photometer, by which an area illuminatedby source A on a background illuminated byB, is compared against an area of source Bon a background of A. Two contrasts arethus compared together. The form of thephotometer is shown…
Electrical engineering
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