Hydraulic Ram

Hydraulic Ram

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Hydraulic ram from the Paul Laurence Dunbar High School in Washington, D.C., a school that was established in 1870 as the Preparatory High School for Colored Youth. It may date from 1916 when the school moved into a new building specially built for the purpose. The "KNOTT APP. CO. BOSTON" inscription is that of an important apparatus firm. Knott termed it a “Commercial type demonstration hydraulic ram with glass air chamber” so designed that the working parts could be seen in operation.
Ref: L. E. Knott Apparatus Co., Harcourt Equipment for Physics (Cambridge, Mass., 1928), p. 74.
Currently not on view
Object Name
hydraulic ram
L. E. Knott Apparatus Company
place made
United States: Massachusetts, Boston
overall: 13 in x 10 in x 5 1/2 in; 33.02 cm x 25.4 cm x 13.97 cm
overall: 13 in x 10 1/2 in x 8 3/4 in; 33.02 cm x 26.67 cm x 22.225 cm
ID Number
catalog number
accession number
Credit Line
Dunbar High School
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Medicine and Science: Physical Sciences
Data Source
National Museum of American History
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