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Blackboard Railroad Curve

Blackboard Railroad Curve

Usage conditions apply
The edge of this flat wooden blackboard curve appears to be an arc of a circle with a radius of about eleven inches. The object resembles a railroad curve but has a handle at the center and chalk marks.
A chalk mark on the back reads: 4.
Received from the Department of Mathematics at Brown University in 1973.
Currently not on view
Object Name
date made
ca 1900
Physical Description
wood (overall material)
overall: 2.8 cm x 44.7 cm x 10.2 cm; 1 3/32 in x 17 19/32 in x 4 1/32 in
ID Number
accession number
catalog number
Credit Line
Gift of Brown University Department of Mathematics
Drawing Instruments
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Data Source
National Museum of American History
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