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49
antage en anden Vdvidelsescoefficient end den, det anvendte
Glasror 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 förste
Maaneder efter deres Blæsning skulde bidrage til i
mærkelig Grad at forandre dets Volum under Observationernes
Udførelse. Pyknometret benyttedes ved de første Forsøg
uden nogen Sikkerhedskugle, men maatte senere, hvor det0
fyldtes ved lavere Temperaturer, forsynes med en saadan,
indrettet til at trækkes incl over det videre Capillarrør.
Apparatet uden Sikkerhedskugle vil jeg for Kortheds Skyld
betegne som Pyknometer No. 1 og med Sikkerhedskugle
som Pyknometer No. 2. A’et! Hjælp af disse udførtes
følgende Forsøg i den Orden, hvori de her findes opførte.
Pyknometer med Indhold. Vægt Gr. I Luft af sp. Vægt.
I. Pykn. No. tomt ...... 15.9222 0.001200
2. — i 15-9223 0.001200
3- — i med rent Vand at 17- 5 44.3I53 0.001200
4- — - i j* „ r. 17- 5 44-3156 0.001201
5- — i 11 » n >■ 17- 5 44-3I5I O.OOI 201
6. — i ,. Ill...... I7* 5 44.8097 0.00I201
7- — i ,. Ill...... >7- 5 44.8093 O.OO 1201
8. — i ,. VII...... ■7- 5 45-0742 0.00I2 00
9- — i , VII...... 17- 5 45-0738 0.00I2 00
IO. — - 2 tomt....... 18.5665 O.OOI 194
11. — - 2 med I .... af 0. 47.7869 0.001198
12. — - 2 „ I...... 0. 47-7873 0.001198
•3- — - 2 „ I .... „ 0. 47-787I 0.001199
14- — - 2 ,. I . . . . ,. 17- 5 47.7249 0.001201
15. — - 2 „ I .... „ 17- 5 47.7246 0.O0I20I
i6. — - 2 ,. I...... 20. 47-7085 0.001198
•7- — - 2 I...... 20. 47.7087 O.OOI 198
18. — - 2 I...... 8. 47.7696 0.001200
19. — - 2 ,. I . . . . ,. 8. 47-7702 0.001200
2 0. — - 2 I . . . . ,. 4; 47.7810 0.001200
2 1. — - 2 „ I ... . 4- ’47-7808 0.001200
22. — - 2 „ I-...... 13- 47-7487 O.OOI 198
23- — - 2 „ I . . . . ,. 13- 47-7484 O.OOI 198
24. — - 2 med rent Vand ,. 0. 46-9773 O.OOI 191
25- — .- 2 ’ » n » 0. 46.9776 O.OOI 191
26. — - 2 tomt....... 18.5658 0.001191
27- — - i 1, ...... . 15.9216 O.OOI 191
28. — - 2 r........ 18.5656 O.OOI23I
29- — - i 15-9213 O.OOI23I
Til Bestemmelse af Udvidelsescoefficienten af det
anvendte Glas forarbeidedes af det samme Glasrør et andet
engrenet Pyknometer nedentil tilsmeltet og oventil forsynet
med et Capillarrør, idet der ogsaa her sørgedes for
Opvarmning af en saa liden Del af Boret som muligt. Ved
Den norske Nordliavsexpedition. Tornoe: Chemi.
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
pycnometer 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
capillary 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 the order in which they are here arranged.
Pycnometer with Contents. Weight in Grammes. I11 Air with a S]>. Gr. of
I. Pycn. No. i empty . 15.9222 0.00I200
2. — i „ 15-9223 0.00I200
3- — - i with pure water of I7-°5 44-3153 0.00I200
4- — i r » » r 17- 5 44-3I56 O.OO 1201
5- — I r j- !7- 5 44-3I5I 0.001201
6. — I .. Ill 17- 5 44.8097 O.OO 1201
7- — I ,. Ill 17- 5 44.8093 O.OO I 201
8. — I ’,. VII. . . . „ 17- 5 45.0742 0.001200
9- — I , VII 17- 5 45-0738 0.00I200
10. — 2 empty 18.5665 0.001194
11. — - 2 with I. . . . of o.° 47.7869 0.001198
12. — 2 ,. I 0. 47-7873 0.001198
13- — 2 ,. I. ... r 0. Ci Oo 0.001199
14- — 2 ,. I 47.7249 0.001201
15- — 2 ,. I. . . . ,, 17-5 47.7246 O.OO I 20 I
16. — 2 ,. I. -’- 11 20. 47-7085 0.001198
17- — - 2 „ I- . . . „ 20. 47.7O87 0.001198
18. — - 2 ,. I 8. ’ 47.7696 0.00I200
19. — 2 „I. . . . , 8. 47.77O2 0.00I200
20. — 2 ,. I. 4- 47.78IO 0.00I200
21. — 2 ,. I. . . . „ 4- 47.7808 0.00I200
22. — 2 ,. I 13- 47-7487 0.001198
23- — 2 „ I. . . . 13- 47-7484 0.001198
24. — - 2 with pure water,. 0. 46.9773 0.001191
25- — 2 r r 0. 46.9776 0.001191
26. — - 2 empty . L8.5658 0.001191
27- — i — I5.92I6 0.001191
28. — - 2 — I8.5656 O.OOI23I
29. — i — I5-92I3 0.001231-
For determining the coefficient of expansion of the glass,
a single-branched pycnometer was constructed, of the same
length of 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
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