Abstract
The cloud-chambers hitherto used for the photography of track have all, so far as i am aware (with the exception of the Shimizu apparatus), been essentially of the same type. A definite volume change has been produced by the rapid motion of a piston or plunger (forming the "floor" of the chamber) which has been suddenly brought to rest by striking against a base plate. While the volume thereafter remains constant the pressure increases as the temperature within the chamber rises. Whether a water, oil or rubber "seal" is used to prevent leakage past the piston, rather exact workmanship is required in the construction of the except with the axis vertical and with the plunger forming the bottom of the chamber.
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21 articles.
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