A PENDULUM FOR THE REDUCTION TO A VACUUM, 
433 
A comparison of the Old and New Corrections, for the reduction to a vacuum : 
with the Factor by which the former must be multiplied, in order to produce 
the latter: also the Weight of adhesive air, dragged by the pendulum. 
Pendulums. 
No. 
Old 
correction. 
Factor 
n 
New 
correction. 
Weight of 
adhesive 
air. 
fPlatina 
Spheres, l|-inch diameter .... ^ B r ^ s 
L Ivory 
1 
2 
3 
4 
2-709 
5-003 
7-343 
30-080 
1-881 
1-871 
1-834 
1-872 
5-104 
9-362 
13-467 
56-310 
Grains. 
0-496 
0-468 
0-457 
0-472 
Spheres, 2-inch diameter < 
f Lead 
on knife edge < Brass 
L Ivory 
v . [Lead 
on cylinder . . < T 
J | Ivory 
5 
6 
7 
8 
9 
4-988 
7-032 
32-143 
4-988 
32-143 
1-738 
1-751 
1-755 
1-7461 
1-741/ 
8-668 
12-317 
56-420 
doubtful 
cases. 
1-115 
1-140 
1-164 
f with wire, 
2- inch Brass J 
cylinder j with rod < 
flat sides horizontal .... 
'flat sides vertical * . . . . 
flat sides vertical f . . . . 
^flat sides horizontal. . . . 
10 
11 
12 
13 
6-882 
6-859 
6-859 
6-859 
1-860 
1-920 
1-950 
1-922 
12-800 
13-169 
13-377 
13-188 
1- 945 
2- 378 
2-451 
2-382 
4 -inch 
Brass < 
cylinder 
f solid, filled with lead 
fboth ends open 
I top open, bottom closed .... 
hollow < top closed, bottom open. . . . 
both ends closed 
(.hermetically sealed 
14 
15 
16 
17 
18 
19 
5-448 
22-172 
21-437 
21-955 
21-227 
25-191 
2-032 
1-925 
1-940 
1- 975 
2- 000 
2-070 
11-070 
42- 686 
41- 582 
43- 378 
42- 468 
52-150 
4-558 
4-045 
4-165 
4-283 
4-454 
4-532 
Lens, one inch thick, Lead 
20 
5-000 
1-580 
7-900 
0-438 
Long cylindrical rod, Copper 
21 
6-519 
2-932 
19-117 
4-904 
Kater’s Invariable, Brass 
22 
6-697 
1-590 
10-649 
8-339 
Kater’s Convertible, with the f knife edge A 
wooden tail pieces X / knife edge B 
23 
24 
7-630 
7-630 
2-144 
2-204 
16-356 
16-815 
Long Bars 
2 inches < 
wide 
inch thick, 
\ inch thick- 
f inch thick, 
. 
f knife edge A 
Brass {knife ed§eB 
-r, f knife edge A 
f °PP er {knife edge B 
(.Iron !^ e ed S e £ 
L knife edge B 
f knife edge A 
Brass J knife ed § e B 
{ knife edge C 
L knife edge D 
25 
26 
27 
28 
29 
30 
31 
32 
33 
34 
7-002 
7-002 
6-519 
6- 519 
7*319 
7- 319 
6-980 
6-980 
6-980 
6-980 
1-848 
1-968 
1-891 
1-991 
1- 945 
2- 064 
2-071 
2-078 
2-099 
2-087 
12- 938 
13- 780 
12-330 
12-980 
14- 237 
15- 107 
14-460 
14-569 
14-506 
14-612 
16-705 
19- 049 
20- 986 
23-276 
22-455 
25-435 
j>40-594 
f plane A 
Long Brass tube < Pj ane ^ 
° ] plane a 
(.plane c 
35 
36 
37 
38 
18-546 
18-546 
18-546 
18-546 
2-318 
2-258 
2-267 
2-317 
42-990 
41- 874 
42- 048 
42-974 
45-937 
43- 563 
44- 195 
45- 900 
Clock j 
pendulums < 
on springs 1 
'Mercurial . . . . 
Leaden bob | 
cylindrical rod 
flat rod 
39 
40 
41 
5 312 
5-190 
5-190 
2-343 
2-589 
2-827 
12- 448 
13- 104 
14- 312 
17-003 
17-462 
20-120 
* Cylindrical side opposed to the line of motion. f Flat sides opposed to the line of motion. 
I For the other cases of Captain Kater’s convertible pendulum, see page 427. 
