Roberval balance

Roberval balance made by W & T Avery Ltd. in England

Another example: note that the bottom horizontal beam is hidden under the protective cover

The Roberval balance is a weighing scale presented to the French Academy of Sciences by the French mathematician Gilles Personne de Roberval in 1669.

In this scale, two identical horizontal beams are attached, one directly above the other, to a vertical column, which is attached to a stable base. On each side, both horizontal beams are attached to a vertical beam. The six attachment points are pivots. Two horizontal plates, suitable for placing objects to be weighed, are fixed to the top of the two vertical beams. An arrow on the lower horizontal beam (and perpendicular to it) and a mark on the vertical column may be added to aid in leveling the scale.

单词	Roberval balance
释义	Roberval balance 英语百科 Roberval balance The Roberval balance is a weighing scale presented to the French Academy of Sciences by the French mathematician Gilles Personne de Roberval in 1669. In this scale, two identical horizontal beams are attached, one directly above the other, to a vertical column, which is attached to a stable base. On each side, both horizontal beams are attached to a vertical beam. The six attachment points are pivots. Two horizontal plates, suitable for placing objects to be weighed, are fixed to the top of the two vertical beams. An arrow on the lower horizontal beam (and perpendicular to it) and a mark on the vertical column may be added to aid in leveling the scale.
随便看	displacement flow displacement flowmeter displacement fluid displacement flux displacement follow up unit displacement force displacement form displacement formula displacement formulation displacement fracture displacement function displacement gage displacement gas meter displacement gauge displacement gearing displacement generator displacement geophone displacement governor displacement gradient displacement graticule displacementgraticule displacement gyro assembly displacement gyroscope displacement head displacement height