Consul the Educated Monkey
In 1915, William Henry Robertson, a draftsman at NCR, applied for two patents. The first, for "a calculating device," was for "a quick and simple method of finding results" on a chart. The second was for a toy using the same mechanism "to stimulate the interest of children in the study of numbers." In this second patent, the linkage took the form of a monkey. Robertson assigned both of his patents to the Educational Novelty Company of Dayton, which soon was selling Consul.
Directions card: Height x Width: 92 x 125mm
Metal Monkey: Height x Width: 150 x 138mm