= Rotating-table demonstration of Coriolis deflection
The Technische Universität Darmstadt demonstration uses a steel ball launched outward from the centre of a rotating disc. A fixed lecture-room camera records a straight path, while a camera carried above the disc records a curved path. The instructions specify launching toward the fixed camera so that the laboratory motion is clearly visible. The rotating iPod transmits its view wirelessly through Apple TV; two vertical support rods of length $1\ \mathrm m$ are specified for the slow-motion arrangement. The paired video views are the readout: one physical motion is represented in two <reference frames>.<Coriolis-Kraft at Technische Universität Darmstadt>[Coriolis-Kraft, demonstration M C 13 2: Info; Beschreibung, Hinweis zur Durchführung and Hinweis zum Aufbau]{ref}
A useful preparation control appears in the Universität Freiburg instructions: with the disc stationary, check that the ball travels radially toward its edge. A camera is mounted on supports attached to the disc; turn the disc by hand as the ball leaves its centre and observe the camera view.<Kugel auf rotierender Scheibe at Universität Freiburg>[Kugel auf rotierender Scheibe: Durchführung, Material, Aufbau and Durchführung]{ref}
The inference is a dependence of the observed <trajectory> on the rotating axes; a curved camera trace alone does not isolate the <Coriolis force>. To compare with the constant-<angular velocity> <free particle in rotating coordinates>, measure the disc <angular velocity>, calibrate lengths in the camera image, and compare launches at rest and with opposite rotation directions. These are checks of the ideal model, not reported measurements from the manuals. A rolling ball can exchange <forces> with the surface through <friction>, and hand rotation need not have constant <angular velocity>; an <Euler acceleration> then enters too. The ideal free-ball drawing deliberately omits those effects. Neither manual supplies a numerical uncertainty or a precision measurement of the <Coriolis acceleration>.
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