BENJ. PIKE S, JR., DESCRIPTIVE CATALOGUE. 



Fig. 558. 



able size, and fixed in the lower part 

 of the funnel, the tube projecting 

 through and containing a few drops 

 of colored alcohol, and dipping into a 

 cup containing the same liquid. To 

 use, pour water into the funnel till it 

 covers the bulb of the thermometer to 

 the depth of half an inch, and upon 

 the surface pour a small quantity of 

 ether and set fire to it. Much heat is 

 given out in the combustion of the 

 ether, yet the water will not transmit 

 it downwards in a sufficient quantity to 

 affect the thermometer. 



The experiment may be varied by 

 suspending above the flame of the 

 ether, a glass or metal- 

 lic vessel, containing the 

 same quantity of water 

 as the funnel, which will 

 be found, after the ether 

 is burnt, to have received 

 a much greater quantity 

 of heat than the lower 

 one, as the thermometer 

 will indicate. 



Price, - - $0.75. 

 " with stand, $1.75. 



Steam Boiler. (Fig. 

 559.) This neat appara- 

 tus, called the high pres- 

 sure boiler, shows in a 

 rery lucid manner, the 

 properties of steam, when 

 under more than ordina- 

 ry pressure. It consists 

 of a strong brass globe 

 or boiler, having a long 

 and strong glass tube 

 open at both ends, pass- 

 ing through a stuffing 

 box, air-tight in the top 



