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stedet. Herom kan jeg henvise til den foranstaaende
Afhandling af Professor Mohn. Kronometrenes Gang
bestemtes efter Sammenligning med det ombord værende
Normalkronometer. hvis Stand og Gang var bestemt væsentlig
efter telegrafiske Tidssignaler fra Christiania Observatorium1.
Paa et Par. Steder toges Kronometrets Stand efter dets
Stand for Greenwich Tid og Længden af
Observations-stedet efter Kystkartet.
Observationerne af alle Elementer gjordes i Teltet,
Ved Observation af Solen aabnedes Teltet netop saavidt i
Kum og Tid. som var nødvendigt.
of observation. For details on this head. I can refer to
the foregoing Memoir, by Professor Mohn. The rate of
the chronometer was determined by comparison with the
standard chronometer on board, the error and rate of
which were found chiefly by means of the time-signals
telegraphed from the Christiania Observatory1. At one
or two points, the error of the chronometer was taken
from its error on Greenwich time and the longitude of the
place of observation on the coastal chart.
The observations of all the elements were made in the
tent. For observations of the sun. the tent was opened
to just the necessary extent in space and time.
b. Horizontal Intensitet.
Observationerne og Beregningerne udførtes efter
Instruktionerne i "A Manual of Scientific Enquiry"; Fourth
Edition. 1871 Side 9(3 til 101. Unifilar-Magnetometrets
Konstanter var ved Kew-Observatoriet bestemte saaledes:
Correction for Delingsfejl ved Afbøjningsstangen
ved 1 Foot. = -f 0.00002 Foot. /
.. 1.5 _ = + 0.00004 - j ved
Svinge-Magnet, Værdi af 1 Skaladel = 1.’9.
Afbøjningsmagnetens Correction til 35° F =
0.000130 (t0 — 35) + 0.00000056 (t0 — 35)-.
Induktionskoefficient u = 0.000195. ’
Log it- K ved 60° F = 1.69708.
Der er desuden givet forskjellige Hjælpetabeller, blandt
hvilke en for Værdierne af Log. tc- K og Log 1 •> r3 for
forskjellige Temperaturer:
b. Horizontal Intensity.
The observations and computations were made in
accordance with the instructions contained in "A Manual
of Scientific Enquiry;" Fourth Edition. 1871. pp. 96—101.
The constants of the Unifilar Magnetometer had been
determined at the Kew Observatory, as follows: —
Correction for errors of division of Deflecting Rod
at 1 Foot = -4- 0.00002 foot I , „^ „
at 62" F
,. 1.5 — = + 0.00004 „ I
Vibration Magnet, value of 1 division of Scale 1/9.
Deflecting Magnet, correction to 35° F. ==
0.000130 (t0 — 35) -f 0.00000056 (t0 — 35)2.
Coefficient of Induction i = 0.000195.
Log 7c* K at 60° F = 1.69708.
Moreover, divers auxiliary Tables are annexed, one
of which gives the values of Log. st2 K and of Log. J/2 r3
at different temperatures.
Temp. Log. tts K Log. i r’
F r„ = 1.0 r0’ = 1,3
30 1.69690 9.69859 0.04041
40 6g6 872 054
50 702 885 067
60 708 898 080
7° 714 • 91 i 093
80 720 924 106
go 1.69726 9-69937 0.041 19
Som Exempel paa Observationernes Udforelse og
Beregning hidsættes følgende, efter de fra Kew erholdte trykte
Blanketter udfyldte, Skemata.
To show the mode of taking and computing the
observations. copies of the printed forms in use at Kew
Observatory have been filled out. and here subjoined.
1 Se den citerede A fli. Side 2.
1 See Professor Mohn’s Memoir, p. 2.
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