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•18
disse Omstændigheder var det desværre,- at jeg ikke kunde
faa nogen brugbar Bestemmelse af Indexfejlen. Denne
har jeg senere sögt at finde saaledes:
I Hammerfest den 9de Juli 1878 ved en Temperatur af -f- 8° C. var Indexfejlen (Index-error) -f 2’ 7"
„ — „ 10de „ — „ „ — „ + 10 „ „ — — +23
„ Christiania „ lite Decb. — „ „ — „ — 3 „ „ — — + 2 27
Under Observationerne i Advent Baj var Luftens
Temperatur 3°, hvortil, efter grafisk Interpolation, svarer
en Indexfejl af 2’ 16", der er benyttet til Beregningen
af Højderne.
Den benyttede Solradius er den, som er udledet af
Sammenligning mellem Observationerne af øvre og nedre
Solrand.
Observationsuhr var mit Lominechronometer, der før
og efter sammenlignedes meel Hovedchronometret Reid
ombord.
Reid 19Ä 4’» 0/0 0* 55"’ 0/0
Lommechron. 19 53 58.6 1 44 57.2
Corr. t. Reid — 49 58.6 — 49 57.2
Efter de timevise meteorologiske Iagttagelser ombord var
ved Morgonobs. Kl. 9 a. ni. Baroni. = 755."""1 Temp. 3.°0
„ Efterm.obs. „ ’ 1 p. m. — 755. 0 — 2.6
be dispensed with. As a consequence of’these atmospheric
conditions. I failed to obtain a trustworthy determination
of the index-error. This I sought subsequently to find in
the following manner: —
During the observations taken at Advent Bay. the
temperature of the atmosphere was -J- 3". to which, as
found from diagrammatic interpolation, corresponds an
index-error of 2’ 16". that assumed for computing the
altitudes.
The apparent semidiameter of the sun taken for the
computation, is that determined from a comparison ol’ the
observations of the upper and lower limbs.
On this occasion. I observed with my
pocket-chronometer. which, before and after the observations, was
compared on board with the chief timekeeper (Reid).
Reid 19A 4m 0/0 O’1 55m 0/0
Pocket-chron. 19 53 58.6 1 44 57.2
Corr. to Reid - 49 58.6 — 49 57.2
According to the hourly meteorological observations
on board, the temperature and barometric pressure were
as follows: —
9 a. m. Barometer 755.""" 1 Temp. 5/0
1 p. m. — 755. 0 — 2.6.
1878. August (August) 19—2 0.
Lommechron (Pocket-Chronometer) 2 h’ J.
20s 35™ 59-"6 <? 40° 50’ 0" — 7"
37 13. 0 55 40 i
39 18.4 41 4 55 0
44 43- 2 0 42 3’i 40 ■ 11
50 37-2 42 56 10 — 2
55 52.0 43 17 50 + i
57 20. 0 43 23 45 . — i
59 43- 2 43 33 15 — 4
21 6 32. 0 O 42 57 10 ■ + 3
7 37-6 43 i 20 3
Ved de mindste Kvadraters Methode har Hr. Åstrand
fundet, idet der sættes q>0 = 78°’ 14’ 48". l0 = 1* 2m
15/9, og Reids Correction til Greenwich Middeltid ved
Formiddagsobservationerne -J- 16m 0/0,
O« 2Qm 55s O 47° 8’ 50" + 1"
33 50 G 48 5 5 — 7
34 40 48 3 50 — 4
35 40 © 46 59 ’o — 5
37 28 46 56 10 + ’i
41 55 O 47 51 5 +5
By the method of the least squares, putting <f0 —
78° 14’ 48", ln — 1- 2’" 15/9, and the Reid correction
to Greenwich mean time for the a. m. observations =
-f-16m 0/0, Mr. Åstrand found
Ö - ± 3."3
j (f - o."4 ± J I = ’-j- 0."3 ± 7."8 = + 0/02 ± 0/52.
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