Case of Instruments as supplied to the Royal Ditto as supplied to the Cadets at Addiscombe, 31. 3s., 31. 13s. 6d., and Ditto as supplied to Harrow School 3 0 0 Drawing Paper, plain and mounted-Tracing Paper-Colours-Globes -Drawing Boards-Curves-Black Mirrors-Walking Sticks with Rods. Universal, Horizontal, and Ring Sundials-Models of DiamondsELLIOTT'S Drawing Pencils-Water Colours, &c. Naval Telescopes mounted in German silver : 1 foot long £2 12s. 6d. 2 feet... £3 3s. 30 inches... £4 4s. Night Telescopes with achromatic object-glasses, to be used at sea, in mahogany tubes mounted with brass, 2 feet long, £3 3s. Improved Portable or Military Telescopes, covered with leather, with a sling strap and caps. Regulation Pattern for Royal Engineers, £3 8s. Portable or Military Telescopes, mounted in German silver :— Achromatic Telescopes, 2 feet long, with brass tube, on plain pillar and claw stand, one eye-piece for terrestrial and one for celestial observations, varying the magnifying power, packed in neat mahogany case, £8 88. Achromatic Telescope, 24 feet long, with brass tube, on plain pillar and claw stand, two eye-pieces for terrestrial and one for celestial observations, to vary the magnifying power, packed in neat mahogany case, £10 10s., £12 12s., and £14 14s. Achromatic Telescope, 3 feet long, 24 inches aperture, with brass tube, on plain pillar and claw stand, two eye-pieces for terrestrial and two for celestial observations, the celestial eye-pieces magnifying up to 150 times; packed in neat mahogany case, £21. Achromatic Telescope, 3 feet long, 2 inches aperture, with vertical and horizontal rack and pinions, achromatic finder, two terrestrial and three celestial eye-pieces, those for celestial observations magnifying up to 200 times; packed in a strong mahogany case, £26 5s. Achromatic Telescope, 4 feet long, 34 inches aperture, with brass tube, on plain pillar and claw stand, with sliding steadying rods, and four eye-pieces to vary the magnifying power; packed in a strong mahogany case, £35. 8 Achromatic Telescope, 3 feet long, 34 inches aperture, with vertical and horizontal rack-work motions, achromatic finder, two terrestrial and three celestial eye-pieces, magnifying up to 250 times; packed in a strong mahogany case, £40. Achromatic Telescope, 3 feet long, 32 inches aperture, on an universal equatorial stand in place of the simple pillar and claw stand, £70. Gregorian Reflecting Telescopes with brass tubes, on pillar and claw stands, packed in mahogany cases :— 2 feet, with speculum 4 inches diameter, and rack-work motions, £26 5s. 3 feet, 5 inches diameter, and rack-work motions, £44. **Telescopes of larger dimensions constructed to order. Portable single Opera Glasses or Perspectives for carrying in the waistcoat pocket, mounted in silver, 10s. 6d., £1 1s., £1 11s. 6d., and £2 12s. 6d. Large Binocular Glasses of higher magnifying power than the ordinary opera Glasses, for using at sea, for military purposes, deer stalking, the race course, &c., with shades covered with leather, or in a leather case with sling, £4 14s. 6d. to £7 17s. 6d. SPECTACLES OF EVERY DESCRIPTION. For Microscopes, Electrical and Pneumatic Apparatus, and every other description of Optical, Mathematical, or Philosophical Instruments, see General Catalogue illustrated. s. d. TREATISE ON THE SLIDE RULE, by the Rev. W. ELLIOTT 1 6 BEARDMORE'S HYDRAULIC AND TIDE TABLES 10 0 DESCRIPTION AND USES OF MATHEMATICAL AND OTHER INSTRU MENTS, by MR. HEATHER 1 0 A POPULAR SKETCH OF ELECTRO-MAGNETISM, new edition A POPULAR INTRODUCTION TO EXPERIMENTAL CHEMISTRY, ditto...... 1 6 7 6 PRACTICE OF ENGINEERING FIELD WORK, by Mr. HASKOLL... |