A new method and a new instrument for the determination of the chronometer correction by means of radio time signals
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On the initiative of ProfessorR. Roelofs of the Delft Technological University and the financial support of the ‘Delft's Hogeschoolfonds’, a study was undertaken by the author concerning the reception and the use of radio time signals for the precise determination of the chronometer correction. As a result of this study an entirely new method featuring visual presentation and electronic enlargement of second ticks as transmitted by radio station WWV, was developed. Owing to the international importance of the problem, further development and actual construction of the necessary electronic equipment were carried out under the auspices of the Netherlands National Geodetic Committee, resulting in the Time Signal Oscillograph (TSO), which has now been in experimental use at the Geodetic Institute of the Delft Technological University since August 1953.
The accuracy achieved by the new method is of the order of 1/1000 second, while errors and uncertainties due to atmospheric and/or man-made interference with the reception of the radio time signals have been practically eliminated. Operation of the instrument can be carried out by technically non-skilled persons, and direct reading of the chronometer correction in milleseconds is obtained. No identification is given of any particular second tick; however, this can be readily obtained by means of the standard tone modulation periods of the WWV radio station.
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