49 
antage en anden I’dvidelsescoefficient end den, det anvendte 
Glasrør oprindelig havde. Pyknometret blev først omkring 
4 Maaneder, efterat det var blæst. taget i Brug til de 
Forsøg, som her skulle beskrives; forat ikke den for alle 
Glasgjenstande eiendommelige Contraction gjennem de første 
Maaneder efter deres Blæsning skulde bidrage til i mærke-r 
lig Grad at forandre dets Volum under Observationernes 
Udførelse. Pyknometret benyttedes ved de første Forsøg 
uden nogen Sikkerhedskugle, men maatte senere, hvor det 
fyldtes ved lavere Temperaturer, forsynes med en saadan, 
indrettet til at trsekkes ind over det videre Capillarrør. 
Apparatet uden Sikkerhedskugle vil jeg for Kortheds Skyld 
betegne som Pyknometer No. 1 og med Sikkerhedskugle 
som Pyknometer No. 2. Ved Hjælp af disse udførtes føl- 
geiule Forsøg i den Orden, hvori de her findes opførte. 
/ 
Pyknometer med Indhold. 
Vffigt 
Gr. 
I Luft 
af 
sp. Vægt. 
I. 
Pykn. No. 1 
tomt .... 
15.9222 
0.001200 
2. 
— 
- 
1 
15-9223 
0.001200 
3 - 
— 
- 
1 
med rent Vand af 
i 7-°5 
44-3153 
0.001200 
4 - 
— 
- 
1 
r » n 
n 
i 7 - 5 
44-3156 
0.00 1201 
5 - 
— 
- 
1 
m »i j» 
11 
T 7 - 5 
44 - 3 I 5 I 
0.00 1201 
6. 
— 
- 
1 
„ HI ... . 
11 
l 7 - 5 
44.8097 
0.00 1201 
7 - 
— 
- 
1 
.. ILI ... . 
1 . 7 * 5 
44.8693 
0.001201 
8. 
— 
- 
1 
,. VII 
1 7 • 5 
45.0742 
0.001 200 
9 - 
— 
- 
1 
,. VII . . . . 
„ 
• l 7 ’ 5 
45-0738 
0.001200 
IO. 
— 
- 
2 .torat 
18.5665 
0.001 194 
1 1 . 
— 
- 
2 
med I . . . . 
af 
o.° 
47.7869 
0.00 1 1 98 
12. 
— 
- 
2 
,. I . . . . 
n 
0. 
47 - 78.73 
0.001 198 
13 - 
— 
- 
2 
„ I 
J! 
0. 
47.7871 
0.001 199 
1 4 - 
• — 
- 
2 
, . I 
11 
I 7’°5 
47.7249 
0.001 201 
15 - 
— 
- 
2 
„ I • • • • 
» 
* 7 - 5 
47.7246 
0.00 12.01 
16. 
— 
- 
2 
I 
J1 
20. 
47-7085 
0.001 198 
17 - 
— 
- 
2 
I . . V . 
j; 
20. 
47.7087 
0.001 198 
18. 
— 
- 
2 
.. I . . . . 
j? 
8. 
47.7696 
0.00 1200 
iq. 
— 
- 
2 
» I — 
11 
8. 
47.7702 
0.001 200 
20. 
— 
- 
2 
„ I . . . . 
»? 
4 - 
47.7810 
0.001 200 
2 I . 
— 
- 
2 
r I 
)• 
.4. 
47.7808 
0.001 200 
22. 
— 
- 
2 
„ I 
V 
J 3 - 
47-7487 
0.001 198 
23 - 
— 
- 
2 
„ I 
11 
13 - 
47-7484 
0.001 198 
24 . 
— 
- 
2 
med rent Vand ,. 
0. 
46.9773 
0.001 191 
25 - 
— 
- 
2 
11 11 11 
•• 
0. 
46.9776 
0.001 19 1 
26. 
— 
- 
2 
tomt 
18.5658 
0.001 191 
27. 
— 
- 
i 
15.9216 
0.001 191 
28. 
— 
- 
2 
11 • • • • • 
18.5656 
0.001 231 
29. 
— 
- 
1 
,, • • • • • 
I 5 - 92 I 3 
0.001231 
Til Bestemmelse af Udvidelsescoefficienten af def an- 
vendte Glas forarbeidedes af det samme Glasrør et andet 
engrenet Pyknometer nedentil tilsmeltet og oventil forsynet 
med et Capillarrør, idet der ogsaa her sørgedes for Op- 
varmning af en saa liden Del al Iioret som muligt. V ed 
Den norske Nordhavsexpeditio». Torpoe: CJiemi. 
as possible of the wider tubes, lest it should give to the 
apparatus a coefficient of expansion different to that which 
the glass tubes originally had. The pycnometer was not 
made use of for the experiments to be described here, till 
about 4 months after the tubes of which it consisted had 
been sealed together; for the contraction peculiar to all 
articles of glass throughout the first few months after 
they have been blown might otherwise have occasioned 
an appreciable change in its volume during the progress 
of the observations. For the first experiments, the pycno- 
meter was used without a receiver, but subsequently, ‘when 
filled at a lower temperature, one had to be provided, 
adapted so as to admit of its being drawn over the capil- 
lary tube. The apparatus when used without a receiver 
I shall designate, for the sake of brevity ‘Pycnometer No. 1. 
and when used with a receiver, ‘Pycnometer No. 2.’ By 
means of this instrument the following experiments were 
performed, 
in 
tin 
order in 
Avhicli 
they are here 
arranged. 
Weight 
In Air 
P> 
c-nometer with Contents. 
in 
with a Sp. 
Grammes. [ 
Gr. of 
1. 
Pycn. 
Xo. 
1 
empty . 
' * ‘1 
15.9222 
0.001200 
2. 
— 
- 
1 
» 
I 5-9223 
0.001200 
3 - 
— 
- 
1 
with pure 
water of 
i 7-°5 
44-3153 
0.061200 
4 - 
— • 
- 
1 
11 11 
11 .11 
17 - 5 
44 . 3 l 56 j 
0.001 201 
5 - 
— 
- 
i- 
1! >5 
>• 11 
17 - 5 
44 - 315 I 
0.001 201 
6. 
— 
- 
1 
III. 
17 - 5 
44.8097 
0.00 1 20 1 
7 - 
— 
- 
1 
.. III. 
17 - 5 
44.8093 
0.001 201 
8. 
— 
- 
1 
.. vn. 
17 - 5 
45.0742 
0.001200 
9 - 
• — 
- 
1 
,. VII. 
. . . ,. 
» 7 - 5 
45-0738 
0.001 200 
10. 
_ — 
- 
2 
empty . 
18.5665 
0.001 194 
1 1. 
— 
- 
2 
with I . 
. . of 
o.° 
47.7869 
0.001 198 
12. 
— 
- 
2 
„ I. 
. . . ,. 
0. 
47-7873 
0.001 198 
i 3 - 
— 
- 
2 
,. I. 
0. 
47.7871 
0.001 199 
14. 
— 
- 
2 
„ I • 
...... 
i 7-°5 
47-7249 
0.00 I 20 1 
15 - 
— 
- 
2 
I. 
• • ■ y. 
17-5 
47.7246 
0.001201 
16. 
— 
- 
2 
,- I- 
. . . ,. 
20. 
47.7085 
0.001 198 
17 - 
— 
- 
2 
„ I- 
. . . 
20. 
47.7087 
0.001 198 
18. 
— 
- 
2 
,.' I. 
. . . 
8. 
47.7696 
0.001200 
19. 
— 
* 
2 
I • 
. . . 
8. 
47.7702 
0.001 200 
20. 
— 
- 
2 
,. I . 
. . . ,. 
4 - 
47.7810 
0.001200 
2 i. 
— 
- 
2 
„ I- 
. . . „ 
4 - 
47.7898 
0.001 200 
22. 
— 
- 
2 
,• I- 
13 - 
47-7487 
0.001198 
23- 
* — 
- 
2 
I- 
13 - 
47-7484 
0.001 198 
2 4 - 
— 
- 
2 
with pure 
water ,. 
0. 
46.9773 
0.001 1 91 
2 - 5 - 
- - 
2 
»• V 
>• >• 
0. 
46.9776 
0.001 191 
26. 
— 
- 
2 
empty . 
18.5658 
1 0.001 191 
2 7 - 
— 
- 
1 
— 
15.9216 
0.001 191 
28. 
— 
2 
■ — 
18.5656 
0.001 23 1 
29. 
— 
- 
1 
— . . 
15 - 9-2 13 
| 0.001 23 1 
For determining the coefficient of expansion of the glass, 
a single-branched pycnometer was constructed, of the same 
length 6f glass tubing, with the lower opening sealed up and 
the upper extremity bearing a capillary tube, care being taken, 
as before, not to heat a greater part of the large tube than 
