Steelyard balance

Steelyard balance

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Credit: SHEILA TERRY/SCIENCE PHOTO LIBRARY

Caption: Steelyard balance. This instrument was used to weigh sacks of grain and animal carcasses. It works on the principle of the lever, having a counterbalance (upper centre) which slides along a calibrated arm away from the fulcrum (upper left). The steelyard was invented independently by both the Chinese and Romans around 200 BC. This one dates from the 19th century.

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Keywords: agricultural, agriculture, balance, beam, calibrated, counterbalance, device, early, equipment, farming, historical, history, history of science, instrument, lever, steelyard, technology

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