Body Measuring tools Measurement parts, including the thumb, hand, and foot, have long been used to measure distance. Some of the oldest known mathematical measuring tools were notched bones, such as the Lochango and Ishango bones, which may have been designed for use in counting or multiplication. However, many concepts and objects in astronomy, navigation, surveying, optics, medicine, and other fields cannot be directly or accurately measured with body parts or tools like marked bones.... więcej
Salem Press Encyclopedia of Science, 2022. 2p.