Showing papers on "Marine chronometer published in 1977"

Chess clock with various indicators - comprises indicator elements accommodated in housing and has common chronometer and five digital electronic counters

Abstract: Chess clock has two or more indicators comprising indicating elements accommodated in housing and a common chronometer. The chronometer is provided for common use by the indicators. It can be connected alternately to one of the indicators. Each indicator is provided with a separate switching unit to operate the chronometer and/or a move counter. The housing (4) of the chess clock (U) has five digital electronic indicating elements (4) mounted on either side of two control buttons (3w, 3s) on its front panel (1). The first indicating element on the left of the control buttons indicates hours (4a), the next two indicate minutes (4b) and the last two indicate seconds (4c).

Longitude without time

Abstract: A new lunar method of determining approximate longitude (and coincidentally latitude) without time is presented , explained and illustrated with an example. The method has been specifically designed for emergency use by the practicing marine celestial navigator who normally uses a chronometer and radio time checks but unexpectedly has neither. The method is simple and does not require measuring the arc between two bodies; simultaneous sights; special tables; prior planning; lengthy or difficult computations; or unusual plotting. It utilizes conventional sextant altitude observations, sight reduction and plotting, and a minimum of additional computation. Accuracy of the method is discussed.