Drape Gauge
designed by Pete Jermann

This device measures how far the leading edge of a sheet of paper will extend before it drops 1 inch.  I refer to the measurement as the drape factor and read it as tenths of an inch.  In the above example the drape factor is 41.  Truly consistent and accurate readings would require constant humidity and temperature, however,  for most purposes I was simply interested in the relative flexibility of various papers and such tight controls were not required.

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