Tide time indicator

Details Tide time indicator Tide time indicator

1979-08-02

1981-06-09

Bell, Paul A.

Printed matter

Calendar

235 88R, 235 88N, 235 70A, 235 61R, 235 70R, 283 34, B42D 1500, G09B 2900

Patent

active

042721075

ABSTRACT:
A tidal time indicator for determining tide times at various locations on a specific stretch of coastline comprises a pair of complementary charts. One of the charts is in the form of a map having index marks representing the various locations and which marks are spaced apart at distances corresponding to the known tidal time differences between the particular locations. The other chart is in the form of a rule having a time scale and index marks representing different days, each of these index marks being positioned relative to the time scale at the high or low tide time on the particular day for a reference location on the map chart. Thus, by positioning the rule chart relative to the map chart so as to register a date mark with an index mark on the map chart representing the reference location, the tide times at the other map locations can be read directly off the time scale adjacent their respective index marks on the map. To prepare the charts, information is obtained from Tide Tables.

REFERENCES:
patent: 1486082 (1924-03-01), Fowler
patent: 3135465 (1964-06-01), Squier et al.
patent: 3638311 (1972-02-01), Chin
patent: 3745313 (1973-07-01), Spilhaus
patent: 3825181 (1974-07-01), Banner
patent: 3924104 (1975-12-01), Barron
patent: 3982104 (1976-09-01), Banner

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