extension bar

extension bar

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Description
This extension bar is part of the set of drawing instruments owned and used by Samuel Pierpont Langley, the astrophysicist who served as the third Secretary of the Smithsonian Institution.
Location
Currently not on view
Object Name
extension bar
Measurements
overall: 4 1/4 in x 5/16 in x 3/8 in; 10.795 cm x.79375 cm x.9525 cm
ID Number
PH.161972.10
accession number
161972
catalog number
161972.10
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Medicine and Science: Physical Sciences
Data Source
National Museum of American History
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