100 THE ANTARCTIC MANUAL. 
TasLe VI.—Givineg THE Tension or SaturateD Steam in Millimetres and Inches, 
and the CorresponpiInc HericHTs above THE SEA in Metres and Feet, for 
TeEMPERATURES in FAHRENHEIT degrees. 
Tempe- Barometric Pressure. Height above Sea-Level. 
Saturated 
Steam. Inches. Millimetres. Metres. Feet. 
° Fuhr. 
185 17°05 wpa 433-1 ie 4653 4% 15,267 es 
186 17°42 0°37 442°5 9°4 4476 177 14,681 583 
187 17°81 0°39 452-4 o°9 4292 134 14,082 602 
188 18:20 0°39 462°3 9°9 4113 179 13,493 589 
189 18-59 0°39 472-2 9°9 3937 176 12,917 576 
190 19°00 0°41 482°6 10°4 3756 181 12,324 593 
191 19°41 0°41 493°0 10°4 3580 176 11,744 580 
162 19°82 0°41 503°4 104 3406 174 A1,173 569 
198 20°25 0°43 514°4 11:0 3228 178 10,592 583 
194 20°68 0°43 $25°S 10°9 3054 174 10,021 571 
195 21-13 0°45 536°7 11*4 2876 178 9,436 585 
196 21°58 0°45 548°1 114 2701 176 8,863 573 
197 22°03 0°45 559°6 11°5 2530 171 8,302 561 
198 22°50 0°47 oti’d 11°9 2555 175 7,728 574 
199 22°97 0°47 583°4 11°9 2184 171 7,166 562 
200 23°45 0°48 595°6 12°2 2013 169 6,604 562 
201 23°94 0°49 608°1 12°5 1842 171 6,042 562 
202 24°44 0°50 620°8 Pee 1670 172 5,480 562 
203 24°95 0°51 633°7 12°9 1499 171 4,919 561 
204 25°46 0°51 646°7 13°0 1332 167 4,369 550 
205 25°99 0-52 660-1 13°4 1161 171 3,809 560 
206 26°52 0°53 673°6 13°5 994 167 3,260 549 
207 27°07 0°55 687°3 13°7 824 170 2,703 557 
208 27°62 0°55 701°5 14°2 657 167 2,156 547 
209 28°18 0°56 715°8 14°3 491 166 1,610 546 
210 28°73 0°57 730°3 14°5 325 166 1,066 544 
211 29°83 0°58 745°0 14°7 160 165 523 432 
212 29°92 0:59 760-0 15:0 0 160 0 523 
meter be inspected, it will be seen that the diminution of pressure 
for a given increase in altitude has fallen at 4500 metres to nearly 
one-half of what it is at the sea-level. Hence the efficiency of the 
thermometer as a hypsometric instrument, compared with that of 
the barometer, increases steadily with the altitude, so that for the 
greatest altitude the thermometer is the preferable instrument. 
Fixed Temperatures produced by Steam in contact with Salt and 
Saline Solutions—At the same atmospheric pressure, the tension of 
