Force of Steam. 5 
as possible, I fixed upon spirits of wine, because 
the wicks want no snufling. There wasasmall 
pipe communicating with the trough, for re- 
gulating the supply of spirit of wine. I found — 
it howevera very difficult matter, from various 
causes, to keep the heat constantly equal. 
_ My first object was to try if the water 
would heat through the different degrees of 
temperature in equal times. For this purpose 
I made several experiments with the boiler, 
sometimes half and sometimes two-thirds fulk 
of water, and all the wicks lighted. In order 
to saye time, I generally put hot water into 
the boiler, and let it stand till the iron was — 
heated equally throughout, and then began 
the experiment, the water usually standing at 
120° or upwards. It is unnecessary to go 
through the detail of these experiments; but 
the result is, that water heats through the 
several degrees of ihe thermometer nearly in 
equal times; and when in a closed vessel, the 
same rule holds good, as well above the boil- 
“ing point as below it. It may be proper to 
state the result of one experiment more parti- 
cularly :—the water was heated from 140° to 
280°. in the space of 45 minutes and 31 se- 
conds, all the 12 lights being kept burning, 
and the time in rising through every 10° was 
noted. It rose the first 10° in 3 minutes and 
