x 
a 
on some of the leading Doctrines ef Caloric, &c. 193 
to the quantity of vapour employed, the heat is entirely trans- 
ferred to the refrigeratory, where it is allowed to remain, without 
apparent diminution, for a few minutes. In numerous repeti- 
tions of the same experiment, the accordances were excellent. 
The following table contains the mean results. The water in the 
basin weighed in each case 32340 grains. The globe was held 
steadily in the centre of the water by a slender ring fixed round 
its neck. The distillation was rapidly performed, so that all the 
condensation took place in the globe. 
Table of experimental Results on the latent Heat of differen‘ 
Vapours. 
200 gr. of water distilled, raised 32340 gr. water 
UE rate ty os ‘ zi 42°-5 to 49° 
200 gr. alcohol, spec. gravity 0- 825 : 42 todo 
200 gr. sulphuric ether; boiling point 112° 42 to 44 
200 gr. oil of turpentine... we * 42 to 43°5 
200 gr. petroleum .. 42:5 to 44 
200 gr. nitric acid, spec. gra. 1: 494; boiling 
point 165° .. 42 to 45°5 
200 gr. liquid ammonia, sp. Ets 0- 978 ah 42 to 47'S 
200 gr. vinegar . .. sp. gr. 1-007 str 42-5 to 48°5 
Calculation from the above Table of the specific or latent Heats 
of the Vapours. 
3 . fi 
vee = 161°7 = the number of grains of water 
lst, Water. 
contained in the rebeiseratiry toone of steam. This proportion 
is constant for all the vapours. 
From 42%5 to 212° there are 169°-5; one half of which 
=84°-75, or in round numbers 54°, is the rise of temperature 
which would be produced by ae to water at 42°°5 its own 
weight of boiling water; and aa =0 52, is the elevation which 
200 gr. would occasion on 32340 grains. 
The water was however in reality heated 63 degrees, or from 
42°-5 to 49°. The difference, 6°-5 —0°-52=5°-98, shows the 
quantity of heat added to each of the 161*7 parts beyond what 
the same weight of boiling water would have commuuicated. 
And 5-98 x 161-7 =967°, being the latent heat of the steam 
of water. 
2d. Alcohol. Boiling point 175°. Specific gravity 0-825. 
ea 2 = 0-41, 0-41 multiplied into the specific heat of 
liquid alcohol 0-65, is 0°-266, which represents the elevation of 
ee” produced by adding 200 gr. of boiling hot alcohol 
ol. 53, No. 251. March 1819. N to 
