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. 
Spheres, 1^-inch diameter ..., 
f Platina, 
J Lead... 
j Brass . 
LIvory . 
No. 
Old 
correction. 
Factor 
n 
2-709 
5-003 
7-343 
30-080 
1-881 
1-871 
1-834 
1-872 
New 
correction. 
5-104 
9-362 
13-467 
56-310 
Weight of 
adhesive 
Grains. 
0-496 
0-468 
0-457 
0-472 
f r Lead 
on knife edge < Brass 
Spheres, 2-inch diameter < L Ivory 
v j fLead 
L °n cylinder .. ( Ivory 
4-988 
7-032 
32-143 
4-988 
32-143 
1-738 
1-751 
1-755 
1-746 \ 
1-741/ 
8-668 
12-317 
56-420 
doubtful 
cases. 
1-115 
1-140 
1-164 
‘ with wire, flat sides horizontal 
2-inch Brass J f flat sides vertical * 
cylinder ) with rod < flat sides vertical f 
Lflat 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 
solid, filled with lead. 
"both ends open . 
„ , top open, bottom closed 
,y a ® s / hollow < top closed, bottom open 
4-inch 
cylinder 
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 /knife edge A 
wooden tail pieces % ./ knife edge B 
23 
24 
7-630 
7-630 
2-144 
2-204 
16-356 
16-815 
inch thick. 
Brass 
Long Bars 
2 inches ■< 
wide 
Z inch thick < 
/knife edge A 
/ knife edge B 
{ r, f knife edge A 
c °PP er (knife ed g e B 
x f knife edge A 
Iron {knife edge B 
f knife edge A 
f inch thick. Brass <j ec J& e ® 
4 > 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 
>40-594 
Long Brass tube 
f plane A 
J plane C 
] plane a 
L 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 f Mercurial. 
?! nd 5^. S \Leadenhob ( cylindrical rod. 
on springs 
/flat rod. 
39 
40 
41 
5312 
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. 
X For the other cases of Captain Kater’s convertible pendulum, see page 427. 
