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| Keywords: Mechanically Adding Trigonometric Functions.jpg en These components perform key computations for Tide Predicting Machine No 2 a special purpose mechanical analog computer for predicting the height and time of high and low tides The tide prediction formula implemented by the machine includes the addition of a series of cosine terms The triangular metal pieces are part of slotted yoke cranks which convert circular motion to a vertical motion that traces a sinusoid Each slotted yoke crank is connected by a shaft to a pulley which causes the pulley to follow the sinusoidal motion A chain going over and under pulleys sums each of their deflections to compute the tide The U S government used Tide Predicting Machine No 2 from 1910 to 1965 to predict tides for ports around the world The machine also known as Old Brass Brains uses an intricate arrangement of gears pulleys chains slides and other mechanical components to perform the computations A person using the machine would require 2-3 days to compute a year ™s tides at one location A person performing the same calculations by hand would require hundreds of days to perform the work The machine is 10 8 feet 3 3 m long 6 2 feet 1 9 m high and 2 0 feet 0 61 m wide and weighs approximately 2 500 pounds 1134 kg The operator powers the machine with a hand crank 2016-03-14 11 47 42 own Steven Fine other versions 38 991561666667 -77 029463333333 cc-zero Machines Analog computers National Oceanic and Atmospheric Administration Silver Spring Maryland Tides Harmonic analysis Maritime navigation Mechanical calculators Tide-predicting machines navigation | ||||
