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| Keywords: Million volt x-ray machine Bureau of Standards 1947.jpg x-ray machine at the US National Bureau of Standards now NIST in 1947 It was used to conduct basic research such as x-ray crystallography The two lefthand vertical columns contained a 10 stage voltage multiplier in which 10 capacitors were charged in parallel to a voltage of 140 kV using high voltage kenotron diode vacuum tubes then discharged in series creating a high DC voltage on the top terminal The righthand column is the x-ray tube which accelerates electrons to 1 4 Mev before they collide with a metal target at bottom The 9 horizontal conductors linking the corona rings on the separate columns equalize the voltage drops across each insulator ensuring that the electric field is distributed equally along the columns to prevent arcs A high value resistor extending down the lefthand column with 10 equal taps divides the voltage equally The high voltage electrodes have smooth rounded shapes with no sharp edges to prevent leakage of the charge into the air by corona discharge Note figure at bottom left for scale 1947 Retrieved January 29 2014 from http //books google com/books id 2d1th30kedoC pg PR21 Annual Report of the US National Bureau of Standards for 1947 US Government Printing Office Washington D C image facing p 184 reprinted in Research Highlights of the National Bureau of Standards on Google Books E U Condon Director Bureau of Standards PD-USGov Uploaded with UploadWizard Marx generators X-ray tubes | ||||
