Film: 1824

Science | 1950 | Sound | B/W

Clip:

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Synopsis:

Rays from Atoms.

An historical reconstruction of Farraday , possibly Faraday, nodding his head over his chemical apparatus. A cathode ray tube (used to investigate the passage of electric currents through gases at low pressure). The cathode tube glows with light. A bell shaped cathode apparatus which clearly shows the behaviour of the cathode rays more clearly than the cathode tube. The glow of the cathode rays are seen clearly around the cathode itself. As the pressure falls the rays disappear and their presence is only revealed by a large glow (where they strike a fluorescence screen). Another cathode ray apparatus. A cathode ray tube is used to show that rays are capable of transmitting energy. An experiment to prove that the cathode rays are negatively charged ( a wire is connected to a plate on which the rays fall, as the ray hits the plate it discharges a positive charge on the electroscope). An 1897 cathode ray tube devised by Joseph J Thomson to measure the ratio of charged mass of the particles (rays) named electrons. A part animation reproducing Thomson's experiment that determined the estimate of the actual mass of the electron. The real Sir Joseph Thomson talking about the electron. Another bell shaped cathode with glowing rays (electrons). A photograph of a track of electrons, done using an apparatus (the Wilson cloud chamber) invented by Professor C.T.R. Wilson . Vapour trails of high flying aircrafts. A view of the "Wilson cloud chamber" used to study the vapour trail of charged particles. An animation describing the "Wilson cloud chamber" and how visible trails of charged particles can be photographed. An improved version of the "Wilson cloud chamber" being used by a scientist in atomic research. An electroscope being discharged by electrons. A radio valve used for radio broadcast. The B.B.C. building, London. A radar screen. An early T.V. screen late 40's or early 50's. Sir Joseph Thomson talking about the electrons practical utility. An electroscope. A cathode discharge of electrons. A cathode tube. An animation describing the apparatus and experiment done by Joseph Thomson to calculate the mass of positive rays (ions) i.e. Ionisation of atoms. A series of Crookes tubes (also known as X-ray tubes) similar to those used by W.K. Rontgen (1896) in his experiments. A short reconstruction of Rontgen experiments which showed that lead stops the rays completely and that a shadow was cast, i.e. X-rays uses were observed. A doctor X-ray a patient. An X-ray of the human body showing the pelvic area. Dentistry X-rays. An industrial X-ray machine.


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