Mary Hallock-Greenewalt: The Complete Patents
Mary Hallock-Greenewalt played the piano with the Philadelphia and Pittsburgh Orchestras as a concert soloist, invented her own color organ that she called a "Sarabet" after her mother, and, in her pursuit of the art she named "Nourathar" by combining the Arabic words for "essence of light,"she had to invent the machinery required as well. Numbered among her inventions are the rheostat that allos the gradual fading of light, the mercury switch, and was among the earliest developers of colored gel filters for tinting theatrical lights. Her patent for the rheostat became the subject of an infirngement lawsuit in the lat 1920s against such large corporations as General Electric, a lawsuit that she ultimately won in 1936. This volume collects all eleven of her technology patents, revealing the refinement and evolution of the Sarabet. These patents also enable a clear evaluation of her contributions to visual music, since, as Dr. Betancourt notes in his introduction, the patents allow a much clearer determination of her place in history and a peer-reviewed statement of her accomplishments.
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Patent No 1481132 reissued 16825
Sarabet including a score display device
actuated annular tubes apertures asso automatic causes a turning circuit breaker color play color wheel combination comprising contact members contact terminals de-energized device embodying drawings electric embodying my invention employed filed films fixed contacts fluid connector switches gear wheel 119 hereinbefore described illumination illustrated in Fig indicated lamps light and color light intensity light source light units light-modifying means limit switch located M. H. GREENEWALT Mary Hallock-Greenewalt means for controlling member 33 ment movable contact number of light operative position operatively engages Patent pawls pedals perforated sheet permit pinion pivotally mounted plate 48 plurality of light portion predetermined reflector resistance respective rheostat screw threads sequence Serial shaft 21 Sheets-Sheet signal lamps skeleton frame slider 36 spaced substantially suitable supply circuit conductor supporting switch mechanism tablet switches thereby thereof tion tively trolled tube 47 turning movement uppermost switch vide voltage regulator worm gear