The book Illumination And Photometry was written by author William E William Elgin Wickenden Here you can read free online of Illumination And Photometry book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Illumination And Photometry a good or bad book?
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> 1 n a qa 0) . Fl o tt) V ^ Q K ^ * ^a 120 ILLUMINATION AND PHOTOMETRY The magnetite arc is essentially a direct-current lamp. Its high efficiency and long life per trim may be combined with the advantages of alternating-current generation and distribution by the use of a rectifier to convert the energy into a unidirectional current. A very effective combination of mercury arc rectifier and constant-current transformer has been developed for this FIG. 79. Circuits of transformer set for magnet...ite arc operation. purpose. The general scheme of the set is indicated in Fig. 79. The set is contained within a single iron case provided with facilities for air or oil cooling. The rectifier tubes have an average life of about 900 hours. The magnetite arc is also fur- nished for constant-potential operation equipped with a reflector which gives a form of light distribution suitable for interior illumination. THE ELECTRIC ARC AND THE VACUUM TUBE 121 The mercury arc exhibits all the characteristics of a true metal- lic arc.
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