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This is the most perfect instrument for the purpose for which it is intended, that of ordinary slide projection, the projection of physical apparatus and experiments, and for use with the Lantern Microscope and Polariscope, &c., &c. (the Bellows is instantly removable).
It is provided with the best 42 double Condensers or our New Triple Condenser, by which the focus can be altered to suit the focus of the Objective in use, a decided advantage, for it is easily demonstrated, both by theory and in actual fractice, that one arrangement of condenser most suitable for a short focus objective is not the best when longer focus objectives are uscd. The lens nearest the light is protected from fracture by heat by a thin cover glass, which is separated from the lens by an air space, and should this cover glassever get broken by inattention to the lime, it can be renewed for = bwopenee, and placed in position inone minute. PaTENT APPLIED FOR. i . ToT TAN
e objectives are double combination, specially constructed for projection, interchangeable, and of the following foci, 4, 6, 8, 10, and 12, but after these sizes they are supplied ‘as Bingle Achromatic LECTURERS’ READING LAMP & DES! Lenses and of the most suitable diameters. With Portable Stand. LANTERN CATALOGUE, post free 2 stamps. No Oil. No Mess. No Bother. The Candle burns 4,hours, and is carried in a rec tacle at bottom The Lamp forms a Box four carry a set of slides, all packing up as a nice square parcel
(Registered.) 20/Complete.
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W. I. CHADWICK, 2, St. MAR
The Optical Magic Lantern Jourxt', Feb. 1st, 1892.