- A cathetometer is an upright ruler with a telescope that precisely measures the vertical difference between two points. The form was introduced in Paris around 1815 and the name around 1847. The U.S. Military Academy, which originally owned this example, acquired much of its physics apparatus from Paris.
- Ref: D. J. Warner, “Cathetometers and Precision Measurement: The History of an Upright Ruler,” Rittenhouse 7 (1993): 65–75.
- Currently not on view
- Physical Description
- brass (overall material)
- overall: 54 1/4 in; 137.795 cm
- ID Number
- catalog number
- accession number
- Data Source
- National Museum of American History