45, COENHILL, E.G., AND 122, BEGENT STEEET, W., LONDON. 



583 



Hydrometer, for Oils, Oleometer, 393, 473, 



for Vinegar, 476. 



Government Proof, 424. 



ditto, for Brine, 468. 



Test Jars, 512. 



Twaddell's, 456, 459. 



Universal, 465. 



Tables, Baker's, Comparative, 496, 

 page 558. 



Negretti and Zambra's Improved 

 Patent Strengthened Stem, 

 page 557. 



Hermbstadt's Combined, 507. 



Wooley's, 505. 



Eoberts', 469. 

 Eleaometer, 393. 



Hydrometers described, page 176. 

 Hydrometer Sliding Rules, 1670 to 1672. 

 Hydro-Pyrometer, Bystrom's, page 203. 

 Hydroscope, 1202*. 



Hydro-oxygen Gas Microscope, page 282. 

 Hydro-Pneumatic Apparatus, 2175. 

 Hydrostatic Bellows, 2915. 



Paradox, 2910. 



Press, Bramah's model of, 2940. 

 Hygrometers described, page 68. 

 Hygrometer Screen, page 99. 

 Hygrometric Tables, page 76. 

 Hygrometer Standard, 94. 

 Hygrometers, pages 68 to 80. 



Instructions for use of, page 77. 



Daniell's, 85. 



Jones's, 86. 



Leslie's Thermometric, 84. 



Masons' 91 to 93. 



Oat-beard, 1346. 



Portable, 96. 



Regnault's, 87 and 88. 



Registering, 78 and 80. 



Negretti and Zambra's Improved 

 Self- Recording, page 78. 



Beckley's ditto, 104. 



,, Saussure's, 83. 



Wet and Dry Bulb, pages 73, 74. 



Dine's, 97. 

 Hypsometrical Apparatus, page 92. 



Hooker's Pocket, 133. 



Improved Pocket Registering, 132. 



Iceland Spar, 1074. 



Ice-making Machine, Patent, pages 507, 508. 



Image Plates, 2441. 



Improved Chronograph, 1189. 



Incandescent Lamps, 2755. 



Miniature, 2769. 



Inclined Plane, Electrical, 2468. 



Inclined Plane Model, 3025, 3049*. 

 Inclined Plane and Double Cone, 3032. 

 Inclinometer (see Clinometer), page 299. 

 Indicating Signal Bell, page 460. 

 Indicator to Eye Piece, 937. 

 Indicator Steam Engine, and Papers for ditto, 



page 198. 

 Induction Tube, with Coil of wire, 2698*. 



Coil, apparatus to illustrate, 2706. 



Coils,f or Mining or MilitaryService, 

 page 463. 



Coils, Ruhmkorff's, page 451. 



Callan's, 2705. 

 Inductorium, 2737. 

 Inertia Apparatus, 3028. 

 Inferential Photometer, Lowe's, 3085. 

 Inhalers, glass, 2008. 

 Injecting Syringe, 1009. 

 Injector, Giffard's Model of, 2948. 

 Instructions for Colouring Lantern Slides^see 



Negretti and Zambra's Lantern Manual). 

 Instrument for Cutting Thin Glass, 1005. 

 Instruments, Mathematical Drawing, pages 



330 to 343. 



Instrument to count Seconds, 3305, 1189. 

 Insulated Stands, for Electric and Galvanic 

 experiments, 2430. 



Stool, 2428. 



Wire, 2717, 2811. 



or Isolated Thermometers, 304. 

 Intermitting Springs, apparatus to explain, 



2920. 



Invalid's Portable Alarm, 2804. 

 Inversor, Dr. G. Bird's, 2700. 

 Iron Spheres, for freezing water, 2529. 

 Ivory Pocket Rules, page 340. 



James's, Col. Sir H., Square Rain Gauge, 116. 

 Jars, Air, page 373. 



Deflagrating, 1993. 



Dessicating, 1965. 



for Fountain Experiment, 2905. 



Gas, 1993, page 375. 



Glass, for Coating, 2498. 



Leyden, 2393. 



Medical, 2395. 



with movable coatings, 2396. 



Lixiviating, 2012. 



Mixing, 2027. 



Johnson's Metallic Thermometer, 406. 

 Jordan's Sunshine Recorder, 76. 



Kaleidophone, Wheatstone's, 3067. 

 Kaleidoscope for Lantern, 1822. 

 Kaleidoscopes, 746. 

 Kater's Compass, 1166. 



