It only appeared that way if you were using the wrong paper for the chart recorder. Those that had needles that moved in an arc also had chart paper that was ruled using lines in the "T" axis, and arcs in the "X" axis.
-Chuck Harris Max Robinson wrote:
The issue of the recording stylus apparently moving backward along the time axis shouldn't be a mystery to anyone who remembers the old Brush (brand name) galvanic chart recorders. The pen tip moved in an arc rather than rectilinear and for slow paper movement the graph appeared to move backward in time. I have no idea exactly how virtual stylus works in decoding these recordings but it seems possible that they could account for the recording stylus being moved in an arc rather than a straight line. Regards. Max. K 4 O DS.
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