He wanted her to fight him, to ratchet up the levels of agony.
The ratchet communicates with a train of wheels which work the dial-hands.
The ratchet wheel is acted upon by a pawl which is shown on the diagram.
When the load to be weighed comes upon the platform, the end of the steelyard rises and unlocks the ratchet wheel through the pawl; the sprocket gearing is driven by the friction clutch, and drives the axle of the left-hand small pulley.
The brushes are carried by sleeves which run loosely on the shaft, and to each sleeve is rigidly fixed a ratchet wheel.