72v1 CONSTRUCTION OF WEIGHTS

[Wladimir D]

 In the aid of Koen, I want to separately discuss the sign of the scales in the MV.
These are not ordinary pharmacy scales, which are attached with a rope (hook) to a vertical stand, or they are held by of the hook the hand .
  I believe that this is scales with a pre-adjusted neutral position (for weighing small masses of elements). The cog in the reciprocating-lever (in scale-beam)  of the scales is placed in the conical recess of the vertical rack.
Equilibrium is achieved by selecting loads that are attached to the vertical connecting rod. Equilibrium will be obtained when the arrow and connecting rod are parallel. A similar scheme of scales is depicted in the Egyptian figure of Osiris.
Of course, it would be simpler to achieve equilibrium by putting a counterweight directly into the cup, but this design of the scales eliminates the fear that the counterweight material will react (contaminate)  the substance to be weighed. Especially when the substance to be weighed is a liquid (acid).