It was considered by the writer that characteristics of oscilloscope wave forms representing the varying pressures taking place in the CFR engine cylinder might provide an index to octane ratings of gasoline. Obtaining pressure wave forms on the oscilloscope required some medium for providing an electrical signal in response to engine cylinder pressures. A quartz pressure element was considered as the item that could fulfill this requirement.
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Ebacher, Rudolph W.. "Development of Electro-Mechanical Equipment for the Measurement of Knock Characteristics of Gasolines." (1952). http://digitalrepository.unm.edu/me_etds/109