The original apparatus used stainless-steel wires between meshes away, flowing argon with organic vapor, negative mesh voltage and individual electronic amplifiers. A X-ray source calibrated pulse height while voltage was varied.[ref]
A coincidence circuit defined a narrow proton or pion beam. Scanning it across wires tested localization; the response edge matched the beam width, limiting the inference. Distant counts were attributed to accidental coincidences. Separate Electron scans measured pulse delay versus position, comparing gas mixtures and pulse-height-dependent electronics.[ref]
Thresholds rejected small pulses, reducing detection efficiency. Wire-independence tests did not establish unlimited separation of overlapping tracks.[ref]
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