532 



MB J. Y. BUCHANAN ON 



The steam generator or boiler, B, used at high levels, was a flask made of spun 

 copper and of 500 c.c. capacity. A suitable charge is 300 c.c. of water. With such a 

 charge, and heated by the French lamp, the water boiled in six minutes, with a con- 

 sumption of 12 grammes of spirit. While keeping steam at the rate suitable for the 

 experiment, the lamp consumed 21 grammes of spirit in fifteen minutes, and evaporated 



Fig. i. 



92 grammes of water. For experiments in the laboratory I use a large copper flask 

 of 2 litres capacity. This is a very convenient laboratory vessel. They are manu- 

 factured to replace the glass flasks of Napier's coffee machines for use in restaurants, and 

 they can be had in larger sizes. A copper flask can always be obtained at short notice 



