11-26-2017, 10:37 AM
Ken, your story reminded me the beauty and reliability of old balances.
My balance scale is circa 100 years old. It is 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.
The masses, when used for commerce, were periodically checked by licensed technicians. When the brass mass was worn, he drilled small hole in the mass bottom and filled it with cooper rod. Cooper is slightly heavier than brass.
Jan
My balance scale is circa 100 years old. It is 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.
The masses, when used for commerce, were periodically checked by licensed technicians. When the brass mass was worn, he drilled small hole in the mass bottom and filled it with cooper rod. Cooper is slightly heavier than brass.
Jan