Rows of the image on an inch of paper. The player reads eight rows a
second per unit of roll tempo (tempo 80 comes with a sample rate of
640 Hz), and the tempo counts tenths of a foot per minute, which puts
400 rows on an inch. This is the file's own calibration; whether the
scanner kept it is for an alignment with other copies to tell.
Rows of the image on an inch of paper. The player reads eight rows a second per unit of roll tempo (tempo 80 comes with a sample rate of 640 Hz), and the tempo counts tenths of a foot per minute, which puts 400 rows on an inch. This is the file's own calibration; whether the scanner kept it is for an alignment with other copies to tell.