An Automatic Tide Station

Abstract

For the purpose of high water forecast, an automatic tide station which can send radio signals and can be operated at remote position, has been developed. The gauge consists of the transmitter and the receiving set. Both sets are controlled by the clocks, and the height of the tide is recorded on the chart once an hour. The frequency of the radio wave is 414 m_??_ sec^-1.
The principle of remote recording is that of so-called Olland system. Synchronization of the transmitter and the recorder is caused by a small permanent magnet motor with a speed regulater. The automatic zero adjust of the record is made by a long sign of the signal in every cycle, and the height of tide is marked with a dot by the short signs on the chart.
These equipments have been tested at the Central Meteorological Observatory and the Tsukishima tide station in Tokyo, from Oct., 1953. The accuracy of the measurement of tide height was within about 1%.
Power required for the transmitter is 6V 3W, for which 6 pieces of 500 AH air wet depolarized cells are used.