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Tide-Predicting Machine No. 2, also known as Old Brass Brains, [1] was a special-purpose mechanical computer that uses gears, pulleys, chains, and other mechanical components to compute the height and time of high and low tides for specific locations. The machine can perform tide calculations much faster than a person could do with pencil and ...
The first tide predicting machine (TPM) was built in 1872 by the Légé Engineering Company. [11] A model of it was exhibited at the British Association meeting in 1873 [12] (for computing 8 tidal components), followed in 1875-76 by a machine on a slightly larger scale (for computing 10 tidal components), was designed by Sir William Thomson (who later became Lord Kelvin). [13]
[2] [3] What is essentially a Scotch yoke is used in the Tide-Predicting Machine No. 2 to generate a sinusoidal motion (sine functions).
Doodson used and became involved in the design of tide-predicting machines, of which a widely used example was the "Doodson-Légé TPM". [6] [7] Portugal and Japan ordered a machine in 1923, Brazil in 1927, made by Kelvin, Bottomley & Baird.
The calculations of tide predictions using the harmonic constituents are laborious, and from the 1870s to about the 1960s they were carried out using a mechanical tide-predicting machine, a special-purpose form of analog computer. More recently digital computers, using the method of matrix inversion, are used to determine the tidal harmonic ...
Tide-Predicting Machine No. 2 This page was last edited on 25 September 2022, at 00:20 (UTC). Text is available under the Creative Commons Attribution ...
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Tide-predicting machine; Tide-Predicting Machine No. 2; Rajko Tomović ...