Steam iLugine. 
Table continued. 
6 ^ 
'empe- 
Force of Vap. 
Tempe- 
Force of vap. 
Tempe- 
Force of vap- 
ature. 
in inches of 
rature. 
in inches of 
rature. 
in inches df 
mercury. 
mercury. 
mercury. 
257® 
64. 
82 
2800— 
88. 
75 
303C^ 
115. 
32 
258 
65. 
78 
281 
89. 
87 
304 
116. 
50 
259 
66. 
75 
282 
90. 
99 
305 
117. 
68 
260 
67. 
73 ' 
283 
92. 
11 
306 
118. 
86 
261 
68. 
72 
284 
93. 
23 
307 
120. 
03 
262 
69. 
72 
285 
94. 
35 
308 
121. 
20 
263 
70. 
73 
286 
95. 
48 
309 
122. 
37 
264 
71. 
7i 
287 
96. 
64 
310 
123. 
53 
265 
72 
76 
288 
97. 
80 
311 
124. 
69 
266 
73. 
77 
289 
98. 
96 
312 
125. 
85 
267 
74. 
79 
290 
100. 
12 
313 
127. 
00 
268 
75. 
80 
291 
101. 
28 
314 
128. 
15 
269 
76. 
82 
2^'2 
102. 
45 
315 
129. 
29 
270 
77. 
85 
293 
103. 
63 
316 
130. 
43 
271 
78. 
89 
294 
104. 
80 
317 
131. 
57 
272 
79, 
94 
295 
105. 
97 
318 
132. 
72 
273 
80. 
98 
296 
107. 
14 
319 
133. 
86 
274 
82. 
01 
297 
108. 
31 
! 320 
135. 
OQ 
275 
83. 
13 
298 
109. 
48 
321 
136. 
14 
‘276 
84. 
35 
299 
110. 
64 
322 
137. 
28 
277 
85. 
47 
300 
111. 
81 
323 
138. 
42 
278 
86. 
50 
301 
112. 
98 
324 
139. 
56 
279 
87. 
63 ; 
302 
114. 
15 
325 
140. 
70 
On Vapour from Ether ^ 
We come now to the consideration of vapour from other 
liquids. Some liquids are known to be more evaporable 
than water ; as liquid ammonia, ether, spirit of wine, 
others less ; as, quicksilver, sulphuric acid, liquid muriate 
of lime, solution of potash, &c. and it appears that the 
force of vapour from each, in a vacuum, is proportionate 
to its evaporability. M. Bettancourt maintains that the 
force of vapour from spirit of wihe is in a constant ratio 
to that from water at ail temperatures ; namely, as 7 to 3 
nearly. My first experiments with spirits of wine led me 
to adopt this conclusion, and naturally suggested that the 
force of vapour from any other liquid would bear a con- 
stant ratio to that of water. The principle, however, is 
