John G. Wood was an accelerator technician who helped develop the hydrogen bubble chamber in Luis Walter Alvarez's group. Alvarez's retrospective describes Wood constructing an all-glass chamber about inches across and observing particle tracks in liquid hydrogen in early 1954. The visible tracks established more than an increase in bulk boiling under irradiation: a usable particle detector needed enough localized bubbles to resolve individual trajectories.[ref]
Recent Developments in Particle Physics by Luis Walter Alvarez. UCRL-18696, printed pp. 13–16, figure 2 and reference 41
Wood's observations also helped show that a long-lived state of superheating was unnecessary. With rapid expansion, useful particle tracks could form in the chamber's interior before boiling at the walls destroyed its sensitivity. That operational insight made larger bubble chambers with joints and windows practical, extending the instrument beyond small, exceptionally smooth all-glass vessels.[ref]
Recent Developments in Particle Physics by Luis Walter Alvarez. Printed pp. 15–16: Wood's observation about superheat duration and its significance for later chambers
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