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 (centre) which slides along a calibrated arm away from the fulcrum (left). The steelyard was invented independently by both the Chinese and Romans around 200 BC. This one dates from the 19th century | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Terry, Sheila |
Taille de l’image : | 3638 px × 2425 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |