Arch spring loading is provided for the stylus of a recorder utilizing pressure-sensitive chart paper carried through a fixed gap between a backing plate and a transparent front plate with means for moving the stylus transversely to the direction of motion of the chart paper in accordance with variations in magnitude of a quantity to be recorded. A steel band movable in accordance with variations in the quantity to be recorded is provided for carrying the stylus. The arch spring is in the form of a bowed piece of thin sheet metal secured to the stylus-carrying band. The stylus may consist of a dimple formed in the edge of the arch spring or in a triangular dimple plate, also secured to the stylus-carrying band and spring loaded by the arch spring.
