847 



SECTION XIX. EDUCATIONAL APPLIANCES 



SOUTH GALLERY, ROOM A. 



4OOO. Apparatus for Instruction in Physical Science. 



Aug. Bel and Co. 



1. Thomas's apparatus for showing pressure produced by dilation of liquids. 



2. Daniel's hygrometer, for measuring the hygrometic state of the air. 



3. Gravesande r s hygrometer, for showing the expansion of metal by heat. 



4. Bar of iron and copper for showing unequal expansion. 5. Apparatus to 

 show the formation of vapour in a vacuum. 6. Air pump for producing a 

 vacuum. 6a. Receiver for ditto. 7. Air pump. 7a. Receiver for ditto. 

 8. Air pump with glass barrel. 8a. Receiver for ditto. 9. Long glass tube 

 mounted to show that heavy and light articles fall with equal rapidity in a 

 vacuum. 10. Wire cage. 11. Heron's fountain for showing the elastic force 

 of compressed air. 12. Water hammer (singing). 13. Haldat's apparatus 

 for showing that the pressure of liquids depends upon their height and the 

 surface of the bottom qf the columns, and not upon the capacities of 

 the vases. 14. Bunsen's spectroscope, for spectral analyses. 14a. Bur- 

 ners for ditto. 146. Platina wire holder for ditto. 15. Hoffmann's 

 spectroscope (2). 16, 17. Polariscopes (5). 18. Magnesium lamp. 18a. 

 Phosphorescent tube. 19. Newton's coloured disc for producing white 

 light by rapid rotation. 20-23. Bichromate of potash batteries. 23a, 236. 

 Ditto, large. 24. Grenet's battery. 25. Induction coil. 26, 27. Appa- 

 ratus for decomposition of water. 28. Galvanometer. 29. Apparatus for 

 rotation of liquids by the electric current, 30. Ditto with hollow magnets. 

 31. Apparatus to show the attraction current. 32. Roget's spiral, for show- 

 ing ditto. 33. Apparatus to show that the electric spark will not pass in a 

 complete vacuum. 34. Astatic needle. 35. Secondary current apparatus. 

 36. Telegraph (two parts). 37. Smee's battery, six cells. 37a. Grove's 

 ditto, five cells. 376. Bunsen's battery. 37c. Set for electrotyping. 38. Set 

 of mechanical powers. 39. Endless screw. 40. Centrifugal machine, four 

 parts. 4 Oa. Double cone. 406. Electroscope. 41. One sportsman. 42. Spark- 

 ling jar. 43. Electroscope. 44. Whirl. 45. Egg. 46. Set of seven bells. 



47. Apparatus for making a hole in a sheet of flass by the electrical discharge. 



48. Diamond jar. 49. Henley's table. 50. Discharging rod. 51. Hand 

 spiral. 52. Two brass plates for pith figures. 53. Electrical swing. 

 53a. Holtz electrical machine. 536. Leyden jar, with movable coating. 

 53 c. Electroscope. 53e. Jar with pith balls. 53/1 Discharging table. 

 53</. Ditto rod. 54. Geissler's tube for showing direction of the current. 

 54a. Stand for ditto. 55-66. Vacuum tubes and stands. 67. Box of five 

 tubes. 68. Tube and stand. 69. Ditto. 69a. Magneto engine for 

 revolving vacuum tubes, &c. 70. Copper hot water funnel. 71. Still and 

 condenser. 72. Small japanned pneumatic trough. 73. Large ditto. 

 74. Copper water bath, nickel plated. 75, Galvanised iron press. 76. 

 Enamelled cast-iron air bath. 77. Bunsen's filter pump. 78. Ditto, 

 modified by Dr. Frankland. 79. Copper oxygen retort and stand. 80-8 la. 

 Berzelius spirit lamp. 82. Revolving test tube stand. 83. Twelve holes and 

 pegs, black. 84. Ditto, with glass pegs. 85 Ditto, in two stages. 86, 87. Test 



