Chart recorders may record several inputs using different color pens and may record onto strip charts or circular charts.Chart recorders may be entirely mechanical with clockwork mechanisms, electro-mechanical with an electrical clockwork mechanism for driving the chart (with mechanical or pressure inputs), or entirely electronic with no mechanical components at all (a virtual chart recorder).
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A chart recorder is an electromechanical device that records an electrical or mechanical input trend onto a piece of paper (the chart).
In 1848-1850 a system of such registers was used by John Locke to improve the precision of astronomical observations of stars, providing timing precision much greater than previous methods.
This method was adopted by astronomers in other countries as well.
Chart recorders are built in three primary formats.