This black hard rubber curve has one opening and numerous scallops on the edges. A mark near the bottom reads: KEUFFEL & ESSER (/) N.Y. This curve is similar to number 19 in catalog entry 1820 in the K & E Catalogue. However, it has an additional notch on the upper left side.
The curve came to the Smithsonian from the Department of Mathematics of Brown University.
Reference:
Keuffel & Esser Company, Catalogue, 1890, p. 140, 1909, p. 206-207. Hard rubber irregular curves are not listed in the 1921 or 1936 catalogs.
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