Blackboard Drawing Instrument, Curve, Hyperbola and Ellipse

Description
This flat wooden blackboard curve has a handle held vertically by screws. A mark on the top edge reads: ELLIPSE. Three marks along that edge indicate endpoints of axes of the ellipse. A mark on the bottom edge reads: HYPERBOLA. A mark at the center of the bottom edge indicates the turning point of the hyperbola. A hole on the right side allows one to suspend the instrument.
Compare 1982.0795.36, which has a similar handle and general construction.
The instrument came to the Smithsonian from the Mathematics Department of the University of Michigan in 1964.
Reference:
Accession File.
Location
Currently not on view
date made
ca 1900
Physical Description
wood (overall material)
Measurements
overall: 2.5 cm x 43.3 cm x 25 cm; 31/32 in x 17 1/16 in x 9 27/32 in
ID Number
1982.0795.37
accession number
1982.0795
catalog number
1982.0795.37
Credit Line
Gift of the Department of Mathematics, The University of Michigan
subject
Mathematics
Drawing Instruments
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Curves
Data Source
National Museum of American History, Kenneth E. Behring Center

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