Magnetic Determinations in Tomsk and Kedrovka in 1918
Abstract Generated abstract
This report presents terrestrial magnetic measurements carried out in 1918 at Tomsk and Kedrovka after a three-year interruption in observations by the physical laboratory of the Tomsk Technological Institute. Using a Bauer theodolite for magnetic observations and a Hildebrand theodolite for solar-altitude astronomical determinations, the author describes the observing sites, reference sights, azimuth determinations, and, for Kedrovka, latitude and longitude. The paper tabulates directly observed magnetic elements without corrections for temporal variation, giving mean values for magnetic declination and horizontal intensity at both locations and recording inclination where measured.
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Addendum: The results of the observations were printed in Izv. Tomsk Technological Institute for 1916, and a map of isogons is given in the work of B. P. Weinberg, “The Normal Distribution of Terrestrial Magnetism in Siberia for 1910” (Izv. Inst. for the Study of Siberia, 5, map No. VII, 1921).
December 1912.
V. D. Dudetskii.
Magnetic Measurements in Tomsk and Kedrovka in 1918
In 1918, after a three-year interruption in the magnetic determinations, magnetic observations in Tomsk and in Kedrovka were organized by the physical laboratory of the Tomsk Technological Institute—in the latter place at the suggestion of the engineer of the Bogoslovsk coal mines, G. V. Oshchevich. In both cases the magnetic observations were made with a Bauer theodolite, and the astronomical observations with a Hildebrand theodolite (exclusively by measurements of the sun’s altitudes). The computations of the astronomical observations were carried out according to the usual formulas. The method of computing the horizontal component was indicated in B. P. Weinberg’s article on the magnetic campaign of 1914. The values of the magnetic elements given below were obtained directly from the observations; no corrections for time variation were made, owing to the absence of barometer records.
The observing point in Tomsk was a place in the garden of the “May Union,” in its southeastern corner, 20 fathoms from the bluff toward the Tom and 50 fathoms from the eastern fence of the garden. The sights used were the chimney of a match factory and a mosque; both sights were at a distance of several versts from the observing place. The azimuth of the chimney was determined as \(30^\circ 29'.2\), and that of the mosque as \(23^\circ 50'.0\), from the south toward the west.
In the village of Kedrovka the observations were made on a post driven in for this purpose on a stony hillock beyond the village. The sights used were: a) the middle of a dormer window in the roof of a peasant house, visible from the observing place; b) the middle of the top of a dry tree, situated at the same height above the horizon as the first sight; and c) a solitary tall tree on the horizon. Determinations of the azimuths of these sights gave: a) \(22^\circ 53'\), b) \(28^\circ 27'\), and c) \(25^\circ 47'\). The latitude from meridian altitudes of the sun was found to be \(\varphi = 55^\circ 32'.5\), and the longitude, by two transported chronometers, \(\lambda = 4^{\mathrm h} 51^{\mathrm m}\) from Tomsk, or \(84^\circ 56'\) from Pulkovo.
| Place | Date | Time of observation | Magnet collimation | \(\delta\) | \(H\) | Magnetic moment at \(20^\circ\) | \(J\) |
|---|---|---|---|---|---|---|---|
| Tomsk | 17.7.18 | \(1^{\mathrm h} 53^{\mathrm m}\) | \(1'8\) | \(-11^\circ 36'.7\) | \(1^{\mathrm h} 30^{\mathrm m}\ 0.16631\) | 287.81 | — |
| Tomsk | 17.7.18 | \(4^{\mathrm h} 36^{\mathrm m}\) | \(1'8\) | \(-11^\circ 38'.2\) | \(3^{\mathrm h} 46^{\mathrm m}\ 0.16723\) | 287.04 | — |
| Tomsk | Mean | — | — | \(-11^\circ 37'.4\) | — \(0.16677\) | 287.42 | — |
| Kedrovka | 9.9.18 | \(2^{\mathrm h} 48^{\mathrm m}\) | \(3'3\) | \(-11^\circ 37'.1\) | \(3^{\mathrm h} 20^{\mathrm m}\ 0.16764\) | 285.94 | \(73^\circ 18'\) |
| Kedrovka | 26.7.18 | \(6^{\mathrm h} 45^{\mathrm m}\) | \(3'3\) | \(-10^\circ 53'.0\) | \(6^{\mathrm h}\ 7^{\mathrm m}\ 0.17117\) | 286.23 | \(72^\circ 04'\) |
| Kedrovka | 26.7.18 | \(2^{\mathrm h} 14^{\mathrm m}\) | \(3'4\) | \(-10^\circ 52'.0\) | \(1^{\mathrm h} 50^{\mathrm m}\ 0.17061\) | 287.32 | — |
| Kedrovka | Mean | — | — | \(-10^\circ 52'.5\) | — \(0.17089\) | 286.78 | — |
October 1918.