52 
Steam Engine. 
Degrees 
of 
Pressure in terms of 
atmospheric pressure. 
Degrees 
OT* 
Pressure in terms of 
atmospheric pressure. 
Thermometer. 
Vapour 
of 
Water. 
Vapour 
of 
Alcohol. 
ThermoiTieter. 
Vapour 
of 
Water. 
Vapour 
of 
Alcohol. 
Reau. 
Fahr. 
Reau. 
Fahr. 
65 
•45245 
1-0795 
88 
230 
1-4872 
3-2548 
66 
180| 
•47765 
M385 
89 
2324 
1-5618 
3-3806 
67 
182^- 
•50414 
1-2004 
90 
234| 
1-6382 
3-5099 
68 
185 
•53199 
1-2652 
91 
2363 
1-7176 
69 
187i 
•56126 
1-3330 
92 
239 
1-8003 
70 
1891 
•59203 
1-4038 
93 
24U 
1-8851 
71 
191| 
•62436 
1-4778 
94 
243* 
1-9733 
72 
194 
•65832 
1-5552 
95 
245-J 
2-0643 
73 
1964 
•69403 
1-6359 
96 
248 
2-1579 
74 
198|i 
•74589 
1-7199 
97 
2504 
2-2539 
75 
200^ 
•77096 
1-8075 
98 
2521 ' 
' 2-3527 
76 
203 ’ 
•81236 
1-8985 
99 
2544 
2-4533 
77 
205-1 
•85588 
1-9932 
100 
257 
2-5554 
78 
207J 
•90214 
2-0855 
101 ! 
1 2591 
2-6587 
79 
209-1 
•94957 
2-1895 
102 i 
2611 
2-7628 
80 
212 
1-0000 
2-2983 
103 
263| 
2-8667 
81 
214| 
1-0519 
2-4074 
104 1 
266 
2-9735 
82 
216| 
1-1064 
2-5177 
105 I 
2681 
3-0711 
83 
218| 
1-1634 
2-6345 
106 
2701 
3-1691 
84 
22 ^ 
1-2232 
2-7527 
107 1 
272| 
3-2631 
85 
223f 
1-2851 
2-8739 
108 1 
275 
3-3505 
86 
225^ 
1-3500 
2-9977 
109 
2771 
3-4299 
87 
227| 
1-4177 
31236 
110 1 
2791 
3-5127 
Several curious and in some respects useful conse- 
quences might be deduced from these experiments and 
theorems. M. Bettancourt shews for instance, that the 
effect of steam engines must, in general, be greater in win- 
ter than in summer, owing to the different degrees of 
temperature in the water of injection. And from the 
greatly superior strength of the vapour of spirit of wine 
over that of water, he argues that, by trying other fiuids, 
some may be found, not very expensive, whose vapour 
may be so much stronger than that of water, with the 
same degree of heat, that it may be substituted instead of 
water in the boilers of steam engines, to the great saving 
iii the expence of fuel : nay, he even asserts, that spirit 
of wine itself miglit thus be employed in a machine of a 
