234 MAGNUS ON THE EXPANSIVE FORCE OF STEAM. 
Table of the Expansive Forces calculated according to the formula 
74475 ¢ 
e = 4mm-595 , 1023469-+7, 
Caen nn eee ee LEEEI UEEEEEEEEIEIIN | DEEIEIEN EEEEEEEEEERIRE 
t. Be | RE e. t. e. | t. e. & e. 
°¢, mm. || °C. mm. || °C. mm. || °C. zam,,.. |}, Ci mm. 
—20 | 0916 |\+8 7-964 || 36 | 44-268 || 64 | 178-397 92 566°147 
=—19 | 0-999 | 9 8-525 || 37 | 46:758 | 65 | 186-601 93 587836 
—18 | 1-089 || 10 9-126 || 88 | 49-368 | 66 | 195-124 94 610:217 
—17 | 1186 || 11 9-751 || 39 | 52-103 |! 67 | 203:975 || 95 633-305 
—16 | 1-290 || 12 | 10-421 | 40 | 54:969 | 68 | 213166 | 96 657-120 
—15 | 1-403 || 13 | 11-180 || 41 | 57:969 | 69 | 222-706 97 681:683 
—14 | 1-525 |} 14 | 11-882 || 42 | 61:109 | 70 | 232-606 || 98 707-000 
=138 | 1-655 || 15 | 12677 || 43 | 64-396 | 71 | 242-877 99 733°100 
—12 | 1-796 || 16 | 18-519 || 44 | 67-833 | 72 | 253:530 || 100 760-000 
=11 | 1-947 || 17 | 14-409 || 45 | 71-427 || 73 | 264°577 || 101 787°718 
=10 | 2-109 || 18 | 15°351 |) 46 | 75185 | 74 | 276-029 || 102 816:273 
— 9| 2-284 || 19 | 16°345 l 47 | 79-111 || 75 | 287-898 1038 845-683 
= 8 | 2471 || 20 | 17-396 || 48 | 83-212 ' 76 | 800-193 || 104 $75:971 
— 7 | 2671 |, 21 | 18-505 || 49 | 87-494 | 77 | 312:984 || 105 907:157 
— 6 | 2:886 || 22 | 19:675 || 50 | 91-965 | 78 | 326°127 || 106 939-260 
— 5] 3-115 || 23 | 20-909 || 51 | 96-630 | 79 | 339-786 |} 107 972-296 
— 4) 3:36) || 24 ! 22-911 | 52 | 101-497 | 80 | 3853-926 | 108 | 1006-300 
— 3| 3:°624 || 25 | 23-582 || 53 | 106572 | 81 | 368°558 || 109 | 1041-278 
— 2) 3-905 || 26 ; 25-026 | 54 | 111-864 || 82 | 883°697 | 110 | 1077-261 
— 1| 4-205 || 27 | 26-547 || 55 | 117:378 | 83 | 899:357 || 111 | 1114-268 
0 | 4:525 } 28 | 28-148 || 56 | 128-124 |, 84 416°552 || 112 | 1152321 
+ 1 4:867 || 29 | 29-832 | 57 | 129-109 | 85 | 432:295 | 113 | 1191-444 
+ 2) 52381 | 30} 31-602 || 58 | 135-341 | 86 | 449-603 | 114 1231-660 
+ 3 5-619 |, 31 | 33-464 || 59 | 141-829 || 87 | 467-489 | 115 | 1272-986 
+ 4| 6-032 || 32 | 35-419 || 60 | 148-579 | 88 | 485:970 | 116 | 1815-462 
+ 5 | 6471 || 38 | 37-473 || 61 | 155-603 | 89 | 505-060 | 117 | 1359-094 
+ 6) 6:939 | 34 | 39-630 || 62 | 162908 | 90 | 524°775 || 118 | 1403-915 
+7 | 74386 | 35 | 41-893 | 63 | 170-502 | 91 | 545:13838 | 
[For the following note (referred to at p. 228.) the Editor is in- 
debted to Professor Miller of Cambridge, to whose revision the trans- 
lation has been submitted. ] 
According to the definition of Laplace in the introduction to the 
Exposition du Systeme du Monde, 100° C. is the temperature of boiling 
water (supposed to be the same as that of the steam) under the pressure 
of 0°76 metre of mercury at O° C. at the mean level of the sea in lat. 
45°. Now they all assume the boiling-point to be the temperature of 
steam under the pressure of 0°76 metre of mercury at O° C. at any 
place—Berlin or Paris. But on account of the variation of gravity, 
the pressures of 0°76 metre at those places are considerably different 
from that of 0°76 metre in lat. 45°; for instance, in lat. 51° 12! the 
pressure of 0°759°52 metre of mercury is equal to the pressure of 0°760 
in lat. 45°. The difference of half a millimetre, or about 0°02 inch, is 
a magnitude which these observers pretend not to neglect. 
