Theodore Bergner Section Liner
Theodore Bergner Section Liner
Usage conditions apply
- Description
- This instrument consists of an isoceles right triangle in brass, with a hole of the same shape. A thumbscrew attached to the hypotenuse of the of the triangle holds a shaped metal plate which can rotate. Attached to this plate is a lever somewhat resembling a telegraph key. There is no rule nor room in the case for a rule. On April 2, 1872 Bergner took out a patent for a parallel ruler. However, it had a rule and a prawl not in this instrument. The instrument is in a velvet-lined, leather-covered case.
- Location
- Currently not on view
- Object Name
- Section Liner
- section liner
- maker
- Bergner, Theodore
- place made
- United States: Pennsylvania, Philadelphia
- Measurements
- overall: 3.5 cm x 14.2 cm x 14.2 cm; 1 3/8 in x 5 19/32 in x 5 19/32 in
- ID Number
- 1985.0438.01
- accession number
- 1985.0438
- catalog number
- 1985.0438.01
- Credit Line
- Gift of Allen A. Samuels
- subject
- Mathematics
- See more items in
- Medicine and Science: Mathematics
- Single Drawing Instruments
- Data Source
- National Museum of American History
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