Hand or Bladder Glass

Hand or Bladder Glass

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Description
This swelled glass vessel open at both ends is designed for tactile experience of air pressure. In use, the larger end is placed on the plate of an air pump, the observer’s hand is placed on the smaller end, and the air is pumped out. Or, the smaller end can be placed on the plate, and the larger end covered with a bladder of some sort.
Ref: Benjamin Pike, Jr., Illustrated Descriptive Catalogue of Optical, Mathematical and Philosophical Instruments (New York, 1848), vol. 2, pp. 201-202.
Location
Currently not on view
Object Name
bladder glass
Measurements
overall: 4 3/4 in x 5 3/4 in; 12.065 cm x 14.605 cm
overall: 4 3/4 in x 6 in; 12.065 cm x 15.24 cm
ID Number
PH.315401.16
catalog number
315401.16
accession number
219414
See more items in
Medicine and Science: Physical Sciences
Data Source
National Museum of American History
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