Weighing scale
Videos
A scale or balance is a device used to measure weight or mass. These are also known as mass scales, weight scales, mass balances, massometers, and weight balances.
Balance scale set, with weights
Scales used to measure the weight of fruit in a supermarket
Digital kitchen scale, a strain gauge scale
Weighing scale for a baby includes a ruler for height measurement
Roberval balance
Videos
The Roberval balance is a weighing scale presented to the French Academy of Sciences by the French mathematician Gilles Personne de Roberval in 1669.
Weighing scale
…calibration; the float system must be corrected for corner errors before the span is corrected by adjusting the balance beam and poise. Roberval balance A Roberval balance. The pivots of the parallelogram understructure makes it insensitive to load positioning away from center, so improves its accuracy, and ease of use…
A Roberval balance made by W & T Avery Ltd. in England
Detail: the bottom horizontal beam is hidden under the protective cover