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OPTICAL LANTERNS, ETC. Optical Projection Apparatus MANUFACTURED BY NEWTON & Co. Telegrams : Partners — Telephone : “ Newtobar, Wesdo, R. S. Wright, M.I.E.E. WELbeck, 4131 London.” E. E. Burnside, A.M.I.E.E. (2 lines). 72, Wigmore Street, and 13, Marylebone Lane, London, W.l. (Late of 3, FLEET STREET, E.C.) I N the following pages will be found particulars of Optical Lanterns for the projection of Lantern Slides, together with numerous accessories for use in conjunction with the various Projectors. For Science Lanterns for demonstration work in the Laboratory and Class Rooms, together with various accessories for use with them, see Part II of Catalogue and for Epidiascopes and other Opaque Projectors, see Part III. It will be noticed that several additions have been made to our range of instruments and that others have been considerably improved both in design and in construction, and that the use of black enamel finish, where such is suitable, is now general, as it has been found that this is usually preferred. TERMS The prices quoted in this list are nett for goods supplied ex Works, London. ELECTRIC LAMPS.—At the prices quoted we guarantee safe delivery of Electric Metal Filament Projection Lamps, and will also exchange any Lamp that fails the first time it is used, but we cannot hold ourselves responsible for consequential damages arising therefrom. Such Lamps must be returned for exchange within seven days of receipt, and in cases where spare Lamps are ordered for future use, it is desirable to test them immediately they arrive. This guarantee applies to \QQ-volt Lamps only. Most instruments can, if desired, be supplied with high-voltage Lamps, thus avoiding the use of a Resistance. This guarantee does not apply to such Lamps. NEWTON & CO., 72 WIGMORE STREET, LONDON, W.l 2