3 stedet. Heroin kan jeg henvise til den foranstaaende Af- kandling af Professor Mohn. Kronometrenes. Gang be- stemtes efter Sammenligning med det ombord vserende Nor- malkronometer, hvis Stand og Gang var bestemt vsesentlig efter telegi'afiske Tidssignaler fra Christiania Observatorium1. Paa et Par. Steder toges Kronometrets Stand efter dets Stand for Greenwich Tid og Laengden af Observations- _ stedet efter Kystkartet. Observationerne af alle Elementer gjordes i Teltet. Yed Observation af Solen aabnedes Teltet netop saavidt i Rum og Tid. som var nodvendigt. of observation. For details on this bead. I can refer to tlie 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, b. Horizontal Intensity. Observationerne og Beregningerne udfortes efter Iu- struktionerne i “A Manual of Scientific Enquiry"; Fourth Edition, 1871 Side 96 til 101. Unifilar-Magnetometrets Konstanter var ved Kew-Observatoriet bestemte saaledes: Correction for Delingsfejl ved Afbojningsstangen ved 1 Foot. = 0.00002 Foot. I .. 1.5 — = + 0.00004 - j ved °2’ Svinge-Magnet, Yaerdi af 1 Skaladel 1/9. Afbojningsmagnetens Correction til 35° F = 0.000130 (tD — 35) + 0.00000056 (t0 — 35)2. Induktionskoefficient u — 0.000195. Log ;i- K ved 60° F = 1.69708. Der er desuden givet forskjellige Hjaelpetabeller. blandt livilke en for Vserdierne af Log. A- K og Log 1/2 r8 for forskjellige Temperature!': 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 de- termined at the Kew Observatory, as follows: — Correction for errors of division of Deflecting Rod at 1 Foot = + 0.00002 foot I „ 1.5 — = + 0.00004 „ ( at b2° *• Vibration Magnet, value of 1 division of Scale = 1/9. Deflecting Magnet, correction to 35° F. = 0.000130 (t„ — 35) + 0.00000056 (t0 — 35)2. Coefficient of Induction u = 0.000195. Log 7i- Iv at 60° F = 1.69708. Moreover, divers auxiliary Tables are annexed, one of which gives the values of Log. ,/r2 K and of Log. 1/3 rs at different temperatures. Temp. | F ■ Log. rr2 Iv Lug'- I r0 = 1.0 r> r</ = 1-3 30 I.6969O 9.69859 0.04041 40 696 872 054 50 702 885 067 6o 708 898 080 ' 70 714 911 • 093 8o 720 924 106 90 1.69726 9-69937 . 0.041 IQ Som Exempel paa Observationernes Udforelse og Be- regning hidsaettes folgende, efter de fra Kew erholdte trykte Blanketter udfyldte, Skemata. 1 Se den citerede Afh. Side 2. To show the mode of taking and computing the ob- servations. copies of the printed forms in use at Kew Ob- servatory have been filled out, and here subjoined. 1 See Professor Molin’s Memoir, p*. 2. 1*

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