588 



Mohr's Burettes, 2211, 2212. 

 Monochord, 3062. 



Moon, Stereoscopic Views of, To Order. 

 Morocco Cases and Trays supplied To Order. 

 Mortars and Pestles, Agate, 2021. 



Berlin Porcelain, 2022. 



Glass, 2024. 



Iron and Brass, 2278.* 



Steel, 2279. 



Wedgwood Ware, 2023. 

 Morse Telegraph Instruments, 3144. 

 Mounting Apparatus, Microscopic, 984. 



Lamps, ditto, 964*. 

 Mountain Barometers (see Barometers, 



page 11.) 

 Muffles, 2026. 

 Multiplying Lenses, 722. 

 Musical Flames, Apparatus for producing, 



2136. 



Napier Pocket Compasses, 1539. 

 Natural Magnets, 2642. 

 Nautical Almanacks and other books, sup- 

 plied To Order. 

 Instruments, page 308, 

 Navigation Scales, 1593 to 1597. 

 Navy Code of Signals, 843. 



Sextants, or Cadet's, 1292, 1293. 

 Telescopes, page 245. 

 Needle Holder, 1528. 

 Needles, Stands for, 2650. 

 Astatic, 2651. 

 Deflecting, Oersted's experiment, 



2661. 



Dipping, 2660. 

 Magnetic, 2648. 

 Negretti and Zambra's Standard 



Meteorological Instruments, and 



Improvements, pages 1 to 133. 



Negretti and Zambra's Military Binocular, 



796, 790*, 



Newman's Colours and Varnishes, 

 Photographic, page 344. 

 Mountain Barometer, 12. 

 ,, Tide Gauge, 174, page 120. 

 Nicholson's Gravimeter, page 190. 

 Nichol's Prisms, 1064, 1065. 

 Night Compasses, 1341. 



Glasses, Captains', Pilots', or Military, 



page 798, 851. 



Telescopes, Inverting, 835. 

 Nitrous Oxide Gas Apparatus, 3116. 

 Nippers, or Cutting Pliers, 2281. 

 Nitrate of Silver, page 549. 

 Bath, page 3319. 

 Nitrogen Apparatus, Ure's, 2143. 



Nitrogen Apparatus, Horsford's, 2145. 

 Will and Varrentrap's, 2144. 



Object Glasses for Telescopes, page 254. 

 Object Glasses for Microscopes, page 268. 

 Objects for Microscope, page 274. 



Oxy-hydrogen Microscope, page 274. 

 Occhiombra, 3115. 

 Oersted's Apparatus, 2661. 

 Off-set Scales for Plotting, page 339. 

 Oil Bath, 2115. 



Oil for Ships' Lamps To Order. 

 Oil Hods, 1678. 

 Oleometer, 473, page 184. 

 Omnimeter, Eckhold's, 1142. 

 Opaque Microscope, 1773, page 361. 

 Opera Glasses, Achromatic, Binocular, page 

 234 to 240. 



Bijou, 806. 



Single or Monocular, 806. 



Sydenham, 806. 



Tom Thumb, 806. 



Aluminium, page 238. 



Duchesse, or Empress, 805. 



Ornamental and Fancy mountings, 

 803. 



Oval or Elliptic, To Order. 



Twelve-lens, see pages 236, 237. 



with Adjusting Centres, 794. 

 Opera Glass, Rock Crystal, page 808. 

 Opisometer, 1279. 

 Ophthalmoscope, 3098. 

 Optical Instruments, and Spectacles, 



page 212. 



Optical Square, 1164. 

 Optics, Models to illustrate, 744. 

 Optometer, 3112. 



Ordnance Measuring Rods and Scales, 

 page 303, 



Pattern set of Surveyors' and 

 Engineers'Instruments,page307. 

 Organic Analysis Apparatus, page 394. 

 Organ Bellows, 3068. 

 Ormolu Frames, To Order. 

 Orreries, page 328. 



Electrical, 2465. 

 Orthoscopic Lenses, To Order. 

 Orometer, 1180. 

 Osier's Anemometer and Rain Gauge, 



page 107. 



Oscillating Steam Engines, models of, 3003. 

 Overshot Wheel, model of, 9442. 

 Oxy-calcium Light (see Dissolving Views), 

 page 358. 



Lamp, 1775. 



Oxygen Gas Retort, 1778, 1779. 



