IN THE HALL OF THE ROYAL SOCIETY 
553 
The gradually increasing differences between this depression and the elasticity 
due to the vapour, have forced upon my mind the unwelcome conviction that, 
by some means or other, gaseous matter has crept into the instrument ; and 
under this impression it was useless to carry the calculations further. 
Register II. 
Temperature and Height of the Water and Mercurial Barometers at 7 a.m. 
in the Summer, and 7 1 ' 30 m a.m. in the Winter, from October 1830 to 
March 1832. 
1830. 
Thermometers. 
Water- 
Barometer. 
Tempera- 
ture of 
Mercurial 
Barometer. 
Water- 
Barometer 
reduced to 
Mercury. 
Difference. 
Elasticity 
of Vapour. 
Difference. 
In. 
Out. 
Mercury. 
October 9 
o 
56 
o 
56 
Inches. 
406'48 
o 
55 
Inches. 
30-416 
Inches. 
29-836 
Inch. 
•580 
Inch. 
•492 
Inch. 
•088 
10 
56 
56 
406-85 
56 
30-438 
29-863 
•575 
•492 
•083 
11 
55-5 
55 
405-63 
50 
30-369 
29-773 
•596 
•484 
•112 
12 
55-5 
56 
404-50 
53 
30-231 
29-690 
•541 
•484 
•057 
13 
55-5 
55-5 
405 04 
52 
30-329 
29-730 
•599 
•484 
•115 
14 
56 
56 
404-50 
52 
30-252 
29-690 
•562 
•492 
•070 
15 
55 
54-5 
403-46 
50 
30-215 
29-614 
•601 
•476 
•125 
16 
55 
54 
403-93 
45 
30-166 
29-649 
•517 
•476 
•041 
17 
54 
54 
405-08 
47 
30-322 
29-733 
•589 
•460 
•129 
18 
53-5 
53 
404-52 
48 
30-220 
29-692 
•528 
•452 
•076 
19 
55 
55 
400-50 
54-5 
29-905 
29-397 
•508 
•476 
•032 
20 
57 
57 
399-89 
59 
29-982 
29-352 
•630 
•508 
•122 
21 
58 
59 
401-38 
59 
30-124 
29-461 
•663 
•526 
•137 
22 
61 
61 
402-29 
62 
30-279 
29-528 
•751 
•577 
•174 
23 
61 
60-5 
403-56 
58 
30-310 
29-621 
•689 
•577 
‘112 
24 
57 
57 
405-60 
52-5 
30-411 
29-771 
•640 
•508 
•132 
25 
55 
55-5 
401-34 
55 
30-080 
29-458 
•622 
•476 
•146 
26 
57 
56-5 
399-28 
52 
29-897 
29-307 
•590 
•508 
•082 
27 
50-5 
50 
405-97 
41 
30-348 
29-798 
•550 
•407 
•143 
28 
53 
53 
399-72 
54 
29-938 
29-339 
•599 
•444 
•155 
29 
56 
55 
394-85 
55 
29-655 
28-982 
•673 
•492 
•181 
30 
54-5 
54 
399-93 
52-5 
29-945 
29-354 
•591 
•460 
•131 
31 
54 
53-5 
399-32 
54 
29-901 
29-310 
•591 
•460 
•131 
Means. . . . 
55-7 
55-5 
402-77 
52-8 
30-162 
29-563 
•599 
•476 
•123 
