Прерывистое освещение поля зрения при методе соответствуюших высот и относительные уклонения отвеса в высоких татрах

Abstract

To determine the relative deflections of the vertical from geodetic data and from astronomical measurements we used the method of equal altitudes, determining the time of passage by means of interrupted illumination of the field of view. The field of view of the telescope used (Zeiss Theo 010 and an astrolabe having an angle of 60°) was therefore supplied with five groups of seven horizontal fibres and during the passage of the two images the field of view was illuminated by a neon tube for a period of about 0·15 s every three seconds. The neon tube was connected either directly to an OMA 50 time signal by means of a transistor receiver or to a chronometer. The calculation was performed by means of relations (1) and (2). Apart from the corrections usually introduced, the personal-instrumental error (containing also a correction from the decimal equation) of the longitudeo _λ and the correctiona _η of the component η were also determined from the measurements. The correctionso _λ=−0·069s ando _η=−0·66″ also contain a correction from the decimal equation. Its value iso ^′_λ =−0·030s for the longitude. The lago _λ−o ^′_λ in reading the interpolation was −0·039 s. The valueo _η=−0·66″ was introduced into the calculation of the vertical components η obtained from measurements in the High Tatras. The values of the corrections are given in Tab. 1.

The method permits measurement of the passages of stars through the almucantar in the meridian. No conclusive proof was found for the impersonality (Tab. 1). The method was verified practically when determining the relative deflections of the vertical in the High Tatras for refining altitude measurements. The results are given in Tab. 2 and Fig. 2. The course of the quasigeoid profile in the Kriváňmeridian was also found (Fig. 3).