PNEUMATICS AIR PUMPS AND APPARATUS. 15 



No. 



313 Fig. 222, Torricellian experiment with tall re- 

 ceiver, - $ 5.00 

 .314 Fig. 222, Torricellian experiment, with tube 



to slide, $3.50 and 4.00 



315 Fig. 223, Torricellian experiment used with 



flexible tube, . 5.00 



316 Fig. 224, water pump in vacuo, with receiver, 8.00 



without " 5.00 



317 Fig. 225, freezing apparatus, - $1.50 and 2.00 



318 Fig. 226, freezing apparatus, with thermo- 



meter, - - - $5 and 7.00 



319 Fig. 127, Wollaston's ehryophorus in vacuo, 



with receiver, - - - 5.00 



320 Fig. 228, flint and steel in vacuo ; common, 3.50 



best, - 5.00 



321 Fig. 229, apparatus to fire gunpowder in 



vacuo, - - - 4.50 



322 Fig. 230, apparatus for showing the effects 



of burnt air, 6.00 



323 Fig. 230, ditto, tube only, fitting-plate and 



receiver, Fig. - 1.50 



324 Cigar tube for smoke in vacuo - - 0.50 



325 Fig. 231, bursting squares, or thin square 



glass bottles, for breaking by the inward. 



or outward pressure of the air, each, 0.16 



326 Fig. 231, cap and valve for bursting squares, 0.31 



327 Fig. 231, wire guard for ditto, - r 0.7 



328 Fig. 232, transferor with two pint receivers, 



$8; quart, $10 ; half gallon, $12 ; gallon, 15.00 



329 Single transferor, $3.50 to 6.00 



330 Fig. 233, fountain by elasticity, - 2.00 



331 Fig. 234, water hammer with stop-cock, - 2.50 



332 Fig. 235, water hammer twelve inches long, 



75 cts. ; twenty-four inches, - - 1.50 



333 Fig. 236, pressure gauge or indicator, - 12.50 



334 Fig. 236, vacuum gauge, - - - 12.50 



