Numerical Marking Abrasive Unit

摘要

An industrial abrasive unit was modified to enable precise, repetitive abrading of small glass columns. The abraded areas completely circle the tubes at preselected intervals. When such markings are scanned by a light beam - photocell combination, they can be graphically recorded as a series of spikes. The presence or absence of spikes at certain intervals can be transposed into Arabic numbers by using a modification of the conventional binary coded decimal. Using numbers 00 to 99 at the top, bottom, or combination of top and bottom of the tubes permits 9,999 different designations.