1030 SEC. 19. EDUCATIONAL APPLIANCES. 



No. of 

 Experiment. 



20. Hollow brass cylinder. 



Bucket to contain it. 



Apparatus for attaching the bucket to balance. 

 21. See Experiment 18. 

 22. Block to illustrate Flotation. 

 24. Apparatus unnecessary. 

 25. Tate's Air-pump. 



Bell-jar receiver. 



Two india-rubber balls. 

 26. Jar with neck and flange. 



Two pieces of india-rubber for it. 

 27,28,29. Box with strings. 



30. Magdeburg hemispheres. 



Brass cock for hemispheres. 

 31. Tube for barometer. 



Glass mortar for cistern. 



Funnel for filling barometer. 

 33. Vibrating wire on support. 

 37. Model thermometer. 



Centigrade thermometer. 

 38. Bladder two-thirds filled with air. 

 39. Further apparatus unnecessary. 

 40. Use tin pan of experiment 1. 

 41. Use flask of experiment 42. 

 42. Flask for boiling water, and cork in duplicate. 



Triangle and wire gauze to support flask. 

 43, 44. Uo special apparatus necessary. 



45. Pan to hold sulphuric acid in vacuo, and shallow vessel to hold water. 

 46. No apparatus necessary. 

 47. Use flask of experiment 42. 



48. Wires to show unequal power of iron and copper to conduct heat. 



50. Use tin pan of experiment 1. 



51. Apparatus to show image of caudle. 



52. Apparatus unnecessary. 



54. Electric pendulum. 



Several pieces of elder-pith. 

 55. Electroscope. 



Electrical machine, 1 6-inch plate. 



Box of amalgam. 

 56. Rod, half brass, half glass. 



Bod of glass covered with red wax. 



Piece of silk. 



Piece of flannel. 

 57. No additional apparatus. 

 58, 59. Brass ball, with point, on insulated stand. 

 60. No apparatus required. 

 61. Ley den jar, pint size. 



Discharger. 

 62. Groves battery, 4 cells in frame. 



Yard of fine platinum Avire. 

 63. Voltameter. 

 64. Electro-magnet. 

 65. Knitting-needle and thread. 

 66. Apparatus for Oested's experiment. 

 67. Thirty feet of covered wire. 



