Technical recording chart showing waveforms and time intervals from a universal cyclometer data logging instrument 插畫檔

This historical technical engraving displays a continuous recording segment from a universal cyclometer tracking device produced in France during the late nineteenth century. The illustration showcases a linear chart with precise numerical markers ranging from five to fifty-five minutes alongside a serrated waveform representing mechanical revolutions or data pulses recorded on a specific day of the week, marked here as Monday. The dual rows of rectangular perforation tracks along the top and bottom borders indicate a film or paper strip roll designed to feed steadily through the automatic measuring device, highlighting early industrial innovations in telemetry, laboratory recording, and velocipede tracking instrumentation.