NEW METHOD FOR INFORMATION PICK UP FROM SPARK CHAMBERS
A short 1971 translated Soviet particle-physics report by Karzhavin, Matyushin, Matyushin and Khachaturyan, issued in English through NASA's technical report series for researchers building spark-chamber detectors. The two figures are hand-lettered line work: a piezoelectric transducer circuit with labelled resistors and capacitors, and a falling amplitude curve set against a grainy photographed oscilloscope trace, all carrying mimeograph blur and a "Reproduced from best available copy" stamp.
