A Battenberg's Course Indicator, U.S. Navy, Mark II mechanical calculating device, circa 1921, in box, 4"h x 13.25"w x 13.25"d. Note: This device invented by Prince Louis of Battenberg in 1892 (though the Mark II specifically was issued around 1895 and some US Navy models date to 1924). It was designed to solve problems involving the relative velocities of two ships at sea

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