best Methods of producing artificial Cold. 279 
Li uor 
Temperature, 
.quor. 
produced. 
* Sal ammoniac 5, nitre 5 
water 16 
4-io® 
Sal ammoniac 5, nitre 5, Glau- 
ber's salt 8 - - 
16 
4 " 4 * 
* Nitrous ammoniac 1 - 
1 
4 - 4 * 
Nitrous ammoniac 1, sal soda 1 
- — — 1 
- 7 * 
Glauber's salt 3 - 
d. nitr. acid 2 
— 3 * 
Glauber's salt 6 , sal ammoniac 
4, nitre 2 - - 
4 
— 10® 
Glauber's salt 6, nitrous am- 
moniac 5 - - 
4 
—14* 
Phosphorated soda 9 - 
4 
— 12* 
Phosphorated soda 9, nitrous 
ammoniac 6 - - 
4 
— 21* 
Glauber”' s salt 8 - 
marine acid 5 
—O® 
Glauber's salt 5 - 
d. vitr. acid 4 
+ 3 m 
N. B. I have chosen the temperature of 50°, because the 
materials may at any time, by immersion in water drawn 
from a spring, be cooled nearly to that temperature, and the 
experiment for freezing with any of these mixtures commence 
there. 
* The salts from each of these may be recovered by evaporating the mixture to 
dryness, and used again repeatedly. 
N. B. The figures after each salt, and after the liquor, signify the proportion of 
parts, by Troy weight, to be used ; the trouble of weighing the water may be saved by 
observing, that a full ounce of it by wine measure corresponds exactly with one ounce 
of it by Troy weight ; likewise it must be noticed, when more kinds of salt than one are 
used, to add them to the liquor one after the other, in the order they stand in the Table : 
beginning on the left hand, and stirring the mixture well between each addition : d. 
nitr. acid, is red fuming nitrous acid two parts, and rain, or distilled water one part, 
O o 2 
