Eb- en Vloedgetij: GETIJKLOK van Jacob Venker "With the hand as a gauging rod"

Custom made clock that tells the tide and tidal streams for your local port and beach

Its mechanism and computer feature a complex calculation combining the lunar and 93 other harmonics.Therefore it is far more accurate than any other existing type of tide clock. The usual cumulative time deviations regularly add up to more than two hours. These clocks reduce it to less than five minutes.

Left: The enamel Tide Clock of Rotterdam on the fa�ade of the Netherlands Marine Pilots Office "Loodswezen Rotterdam-Rijnmond". The hand of the clock shows the local water level and the tide in hours before and past High Tide (HW): It intersects the margin of the local polar tide plot.

Below: Two hours before high tide . 60 cm � wall clock of showing the Harlingen tides. (Rijkswaterstaat, Directorate-General for Public Works and Water Management, Leeuwarden).

JACOB VENKER

5845 CJ St Anthonis The Netherlands

E-mail: [email protected]

Phone : +31 485 382774