Paulo Ribeiro de Arruda, Brazilian electrical engineer (Itapetininga, São Paulo State 30 May 1909 – São Paulo 22 November 1985) Developed an absolute method for determination of frequencies in radio electrical spectrum at his doctoral thesis (1939) Authored Sobre um acessório electromecânico para o oscilógrafo de raios catódicos (1948) Discovered a new type of motion that named caterpillar type Introduced new improvements to electron microscope Developed a number of devices that were not patented PATENTS Polyanalyzer, an electromechanical device that enables the observation and simultaneous record of many periodic signs or phenomena on the screen of a single oscillograph Microtome for ultra-thin sections employing caterpillar type motion (1959) Remote control of micro dislocation by means of caterpillar type motion Automat employing caterpillar type motion A system of grains purge using thermal process (number 957.350) with engineer Lauro Vianna Bacellar |
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