IN THE HALL OF THE ROYAL SOCIETY. 555 
1830. 
Thermometers. 
Water- 
Barometer 
Tempera¬ 
ture of 
Mercury. 
Mercurial 
Barometer 
Water- 
Barometer 
reduced to 
Mercury. 
Difference 
Elasticity 
of Vapour. 
Difference. 
In. 
Out. 
Inches. 
Inches. 
Inches. 
Inch. 
Inch. 
Inch. 
Dec. 1 
5°0-5 
50 
401-04 
50 
29-993 
2 
48 
48 
399-52 
49 
29-857 
3 
49 
48 
396-06 
49 
29-505 
4 
47-5 
47 
397-97 
48 
29-717 
5 
47*5 
47 
398-33 
46 
29-784 
6 
47 
47 
389-76 
49 
29-121 
7 
50 
49 
388-73 
50 
29-118 
8 
55 
55 
390-13 
50 
29-175 
9 
48 
48 
386-57 
50 
28-927 
10 
51 
51 
387-49 
50 
28-992 
11 
45-5 
46 
392-29 
47 
29-286 
12 
43 
43 
393-99 
47 
29-374 
13 
40 
39-5 
404-81 
44 
30-170 
14 
43 
43 
407-13 
46 
30-394 
15 
44 
43 
408-03 
48 
30-526 
16 
43 
43 
406-57 
48 
30-334 
17 
40-5 
40 
403-23 
45 
30-066 
18 
40 
40 
404-37 
43 
30-172 
19 
41-5 
41 
405-12 
45 
30-208 
20 
43 
43 
395-23 
47 
29-475 
21 
45 
45 
395-67 
48-5 
29-525 
22 
47-5 
47 
396-11 
50 
29-576 
23 
42 
42 
394-44 
48 
29-415 
24 
34-5 
36 
392-90 
41 
29-455 
25 
37 
37 
393-50 
34 
29-311 
26 
36-5 
36 
393-95 
40 
29-347 
27 
39 
39 
392-21 
42 
29-806 
28 
40 
40 
389-81 
44 
29-048 
29 
42 
42 
397-53 
43 
29-665 
30 
42-5 
43 
395-13 
45 
29-488 
31 
45 
45 
390.59 
49 
29-158 
Means.. .. 
44-1 
44 
396-39 
46-3 
29-613 
29-094 
•519 
•328 
•191 
1 
