I have an old (1950's) butchers scale that I wish to sell. I would like to be able to define the "movement" or mechanism by which the object is weighed. I seen the movement numerous times and I'm going to try to describe it off the top of my head
(scale is not here by my side).
There is sort of a rectangular frame which pivots on two fixed points, then pivots on two point of another, similar frame. The second frame exerts an upward movement which turns the "dial" (actually a cylinder which can be read on two side (butcher's and customer's).
The scale is highly accurate - within a fraction of an ounce. It has a max of 20 lbs and a total weight of about 70 lbs.
I believe I've seen this type of mechanism (of very inferior quality) in a bathroom scale.
Any ideas? Thanks. John