in each scale, or with 1/9000000 part of the weight.
To the mode of suspending the beam and the scales more attention has probably been directed than to any other part of the balance.
Of some of the European balances, —
Fox's beam has pivots, the conical ends of which play in hollow agate cones of larger angle.
Oertling's beam is coated with platinum or palladium, the knife-edges and planes being of agate, and the instrument proof against acid fumes.
The knife-edscending till the ends of the brushes touch the under side of the pan. The mode of obtaining quiescence of the pan in the periodical intermittence of the coin-weighing apparatus is by a depressed ivory point above and an agate point beneath.
In Fox's balance the beam is brought to zero by the attraction of a magnet.
The sensitiveness of a balance depends (after friction has been reduced to a minimum), first, on the proximity of the center of gravity to the point of suspension on which the