J. Theobald and Company's extra special illustrated catalogue of magic lanterns, slides and apparatus (circa 1900)

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24 For a Tri-unial Lantern, 3 sets will be required, price ;gi8 l8s. the three sets complete, packed in a fitted Mahogany box, with lock and key. N.B.—The above Objective! can be appled to any Lime-light Lantern, and are perfectly rigid when rcuked out to their fullest extent. Should the above Patent Triple-Rack Fronts be required with only one, two, or three Cylinders, the allowance will be l8s. per Cylinder. Any of the Cylinders not ordered at the same time as the Triple-Rack Front can always be supplied afterwards, as they are all made to guage. “New Double Rack Telescopic Optical Lantern Objective," WITH EXTRA LARGE SIZE. Short and long focus. Double Combination Achromatic Lenses. (Patent No. 14809.) For Lime Light Lanterns only, no lengthening Tubes required. These Patent Telescopic Optical Lanterns Objectives are similar in construction to those described on page 23 but have only two racks, and are fitted with extra large size Double Combination Achromatic Lenses, giving more than twice the amount of light obtained with the ordinary size Lenses. The Lenses, which are of the following diameter and focii, are mounted in Brass Cylinders, fitted with sliding shutters or flashers, having grooves to carry shapes of coloured glass for tinting slides. No. I. Brass Cylinder is fitted with i^-in. diameter Double Combination Achromatic Lenses, 4-in. back focus. No. 2.—Brass Cylinder is fitted with 2f-in. diameter Double Combination Achromatic Lenses, 6-in. back focus. No. 3 * Brass Cylinder is fitted with 2§-in. diameter Double Combination Achromatic Lenses, 8-in. back focus. No. 4.—Brass Cylinder is fitted with 3 3/16-in. diameter Double Combination Achromatic Lenses, 10-in. back focus. Each Brass Cylinder has its focal length engraved on it and a set of 6 Coloured Glasses in a leather case for Tinting Slides is sent with each Patent Objective. The Lenses in these Patent Objectives are the same as in quarter-plate, half-plate, three quarter-plate and whole-plate Photographic Portrait Lenses, which are the best for long distances, giving the best results it is possible to obtain. PRICES ARE AS FOLLOW New Double Rack Telescopic Optical Lantern Objective, with set of 4-Brass Cylinders as above described, and set of coloured glass in leather case, packed in a fitted Mahogany Box, with lock and key and brass handle . . Price, per set 5 15 For a pair of Lime Light Lanterns, or for a Bi-unial Lantern, 2 sets will be required, which are packed in a fitted Mahogany Box, with lock and key and brass handle ... ... ... ... Price, the two setS;^3I 10 For a Tri-unial Lantern, 3 sets will be required, which are packed in a fittedMahoganyBox,with lock and key and brass handle. Price, the three sets f/g] 5 The Patent Double and Triple Rack Telescopic Optical Lantern Objectives are perfectly rigid when racked out to their fullest extent, and are far superior to ordinary Telescopic Tubes fitted to ordinary Lanterns. These Objectives can be applied to any Lime Light Lantern. Should the above Objectives be required with only one, two or three Cylinders the allowance will be for the No. I.—Cylinder 6 o >> I> ;^2 O O » 3 - »» - ... £2 17 O >> 4 - » ... ... ... ... ... ... ... ^2 12 o Any of the Cylinders not ordered at the same time as the Double Rack Front can always be added afterwards, as they are all made to guage.