Although observations on marine currents were made near land or between islands even in antiquity, accurate observations on the high seas have only been possible since chronometers furnished a practicable method of determining longitude, i.e. [Please select]
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For watches, chronometers, and small clocks THE SPRING BALANCE takes the place of the pendulum. [Please select]
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That you cannot transmit at the hours reserved for naval radio stations to send out the time signals by which navigators set their chronometers, or when operators are broadcasting, goes without saying. [Please select]
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