- 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.
- Currently not on view
- Object Name
- extension bar
- overall: 4 1/4 in x 5/16 in x 3/8 in; 10.795 cm x.79375 cm x.9525 cm
- ID Number
- accession number
- catalog number
- See more items in
- Medicine and Science: Physical Sciences
- Data Source
- National Museum of American History
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