Sets of scales with weights - Iran This elaborately decorated box contains three sets of equal balance arm scales and weights. Equal balance arm scales suspend two disk shaped pans off either end of a horizontal pole. The weights in either pan must be equal for the pole to remain horizontal. Ingenious locking mechanisms reveal hidden aspects of the box. A spring-loaded button releases a small removable box containing a tiny set of scales, and removing a delicate pin reveals a hidden mirror. This example of boxed weighing scales dates from 1800s Iran. It was used in the medicine and jewellery trades. Both trades required the precise measurements of goods. (science museum, uk)

Sets of scales with weights - Iran

This elaborately decorated box contains three sets of equal balance arm scales and weights. Equal balance arm scales suspend two disk shaped pans off either end of a horizontal pole. The weights in either pan must be equal for the pole to remain horizontal. Ingenious locking mechanisms reveal hidden aspects of the box. A spring-loaded button releases a small removable box containing a tiny set of scales, and removing a delicate pin reveals a hidden mirror. This example of boxed weighing scales dates from 1800s Iran. It was used in the medicine and jewellery trades. Both trades required the precise measurements of goods. (science museum, uk)

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