An air valve designed for the purpose of triggering the expansion of a pneumatic cloud chamber utilizes Bridgman's ``unsupported area'' seal. The valve is controlled by a magnet constructed from the field coil of an inexpensive dynamic loudspeaker. This design allows vacuum tube control of forces up to 75 pounds. High speed of operation (∼1/300 second) recommends its use with counter control, and its extreme simplicity is advantageous in general work.
No takes yet. Share an insight, caveat, or question.
Lewis Fussell (1939) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: