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  2. Tide-predicting machine - Wikipedia

    en.wikipedia.org/wiki/Tide-predicting_machine

    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]

  3. Kelvin equation - Wikipedia

    en.wikipedia.org/wiki/Kelvin_equation

    The Kelvin equation describes the change in vapour pressure due to a curved liquid–vapor interface, such as the surface of a droplet. The vapor pressure at a convex curved surface is higher than that at a flat surface. The Kelvin equation is dependent upon thermodynamic principles and does not allude to special properties of materials.

  4. Tide-Predicting Machine No. 2 - Wikipedia

    en.wikipedia.org/wiki/Tide-Predicting_Machine_No._2

    10.8 feet (3.3 m) long, 6.2 feet (1.9 m) high, 2 feet (0.6 m) wide 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.

  5. Lord Kelvin - Wikipedia

    en.wikipedia.org/wiki/Lord_Kelvin

    Absolute temperatures are stated in units of kelvin in Lord Kelvin's honour. While the existence of a coldest possible temperature, absolute zero , was known before his work, Kelvin determined its correct value as approximately −273.15 degrees Celsius or −459.67 degrees Fahrenheit . [ 13 ]

  6. Differential analyser - Wikipedia

    en.wikipedia.org/wiki/Differential_analyser

    One of the earliest practical uses of Thomson's concepts was a tide-predicting machine built by Kelvin starting in 1872–3. On Lord Kelvin's advice, Thomson's integrating machine was later incorporated into a fire-control system for naval gunnery being developed by Arthur Pollen, resulting in an electrically driven, mechanical analogue ...

  7. Stationary phase approximation - Wikipedia

    en.wikipedia.org/wiki/Stationary_phase_approximation

    with f(x) = ±x 2. The case with the minus sign is the complex conjugate of the case with the plus sign, so there is essentially one required asymptotic estimate. In this way asymptotics can be found for oscillatory integrals for Morse functions. The degenerate case requires further techniques (see for example Airy function).

  8. Dirichlet problem - Wikipedia

    en.wikipedia.org/wiki/Dirichlet_problem

    Lord Kelvin and Dirichlet suggested a solution to the problem by a variational method based on the minimization of "Dirichlet's energy". According to Hans Freudenthal (in the Dictionary of Scientific Biography , vol. 11), Bernhard Riemann was the first mathematician who solved this variational problem based on a method which he called Dirichlet ...

  9. Voigt notation - Wikipedia

    en.wikipedia.org/wiki/Voigt_notation

    In mathematics, Voigt notation or Voigt form in multilinear algebra is a way to represent a symmetric tensor by reducing its order. [1] There are a few variants and associated names for this idea: Mandel notation, Mandel–Voigt notation and Nye notation are others found. Kelvin notation is a revival by Helbig [2] of old ideas of Lord Kelvin ...

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