Futures Contract Specifications. Contract specifications for all North American-traded futures and commodities. Conveniently collected and displayed for easy reference, sorted by sector and market. Note that this specification list is updated manually and might contain inaccuracies. If you notice a problem, please contact TradingCharts.
Jul 24, 2014. J.J. Thomson used a cathode ray tube to discover the electron. Cathode ray tubes are vacuum tubes that contain two electrodes - one on each side. One of the electrodes (the cathode) fires electrons at the other (the anode) when voltage is added to the system. When Thomson fired up the tube, he saw a beam of light between the two electrodes. To figure out what they were, he applied a magnetic field and found out that the beam moved toward a positive charge and away from a negative charge.
The Early Life of J.J. Thomson: Computational Chemistry and Gas Discharge Experiments. Structure of the Atom and Mass Spectrography. In 1904 Thomson suggested a model of the atom as a sphere of positive matter in which electrons are positioned by electrostatic forces.