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 Every description, from the smallest to powerful Engines, of the very best workmanship, at the lowest possible prices, LEE'S NEW ENLARGED and REVISED ILLUSTRATED CATALOGUE contains illustrations and Descriptions of Engines from the smallest to 15 H.P, Paddle and Screw Steamboats from 1s. to 87 guineas; Sailing Yachts, Castings of Engines, Tools, Lathes, Shaping Machines, Foot Motors, Chucks, Parts of Engines, Anchors, Guns, Boiler Fittings, &c., Electric Machines, &c. To Amateurs the most useful hook extant, and largest and best Catalogue in the Trade, 64 pages, 110 illustrations, price 6d. post free.

LEE'S WORLD-FAMED BRASS CASTINGS, with his improved "Tenon" or Chuck Pieces, on all parts requiring to be turned, are supplying a want long felt, being easily turned oven by the most unskilled amateur; Complete sets for Horizontal Slide-valve Engine, ½ in. bore, 7 in, stroke, 2s., post free, 2s, 3d.; ¾ in. bore, 1½ in. stroke, 2s., post free, as. 6d. ; 1 in. bore, 2 in. stroke, 4s. 6d., post free, 5s.; 1¼ in. bore, 2½ in, stroke, 11s. 6d., post free, 12s. 6d,; by Parcels Post. All sizes up to 6 in. stroke at equally low prices. Each Casting has Lee's improved "Tenon," without which model Castings are practically useless.

R. A. LEE is now supplying all his best HORIZONTAL ENGINE CASTINGS, from 1 in, bore, with the Steam and Exhaust Ports accurately cast in the Cylinders, free of charge, thus saying an immense amount of work in fitting up and ensuring accuracy in one of the most important parts of the Engine.

PHOTOGRAPHIC LENSES at Marvellously Low Prices. Single Achromatic, to cover 5 by 4, 7s. 6d.; ditto, half-plate, 10s, 6a. Rapid Rectilinear Lens, with set of Waterhouse Diaphragms for Instantaneous work, to cover 5 by 4, 21s,; half-plate, ditto, 30s. Each of these rapid Rectilinear Lenses will cover the size larger than it is stated to be—i.e., ½-plate will cover 1.1 size, All post-free.

These Lenses are guaranteed of the highest quality, and cash will be returned if not satisfactory. Illustrated Catalogue gratis on receipt of addressed postal wrapper.

To be obtained only of ROBERT A. LEE, Manufacturing Optician. Works:— 76, 77 and 784 High Holborn, London, W.O, (directly opposite Inns of Court Hotel).