Abstract: A chart recorder is described, of the type which includes a strip of pressure-markable chart paper (12, FIG. 1) that is slowly moved downpath past a marking station (30) where at least one stylus (32) presses against the chart strip to mark it, which is compact, reliable, and accurate. The marking station includes a first wide but thin belt (52) extending in a loop between a pair of rollers, with the stylus coupled to the belt so as the output of a temperature sensor turns the belt, the stylus moves across the width of the chart strip. A slider (82, FIG. 3 ) coupled to the stylus and belt, can slide along a lateral guide (90) that resists tilting of the slider, to thereby enable it to keep the stylus pressed against the chart strip. Where two styluses are used, a second independently driven belt is coupled to a second stylus with the second belt lying below the first one. A supply roll (20, FIG.

Abstract: A simple chart recorder is described of the type which includes a strip of pressure-markable chart paper, which includes two pressure marking styluses that create traces that can be readily distinguished from one another. Each stylus has a horizontal inner portion (80, FIG. 2 ) that extends largely parallel to chart paper movement and a vertical outer portion (88), with the first stylus having an inner portion lying above the second stylus and having an outer portion lying further downpath than the second stylus. One of the styluses includes a blue pencil lead (92) whose point creates a pressure-marked trace part (116, FIG. 3 ) as well as blue lines (120, 122) on opposite sides of the trace part. Another stylus includes a wheel (180, FIG. 6) with a plurality of points spaced about its periphery to produce a multipoint trace (172). Another stylus includes two closely-spaced tips (200, 202, FIG. 7 ) that form a doubleline trace (208). Another stylus has a tip with a large radius of curvature (R1, FIG.