26 AUTOMATED, OPTICAL ELECTRONIC DATA ACCUMULATING AND DISSIMULATING EQUIPMENT FOR MEASURING AND DETECTING OPTICAL AND PHYSICAL PROPERTIES OF SPECIMENS UNDER EXAMINATION, AND ELECTRICAL AND ELECTRONIC COMPONENTS AND ACCESSORIES THEREFOR-NAMELY, ELECTRO-MECHANICAL, AUTO-SCAN SPECIMEN STAGE DRIVE APPARATUS, OPTICAL-ELECTRONIC APPARATUS AND ACCESSORIES USED IN CONNECTION THEREWITH, SPECIMEN STAGE LEVELING AND SUPPORTING APPARATUS, DIGITAL COUNTERS AND DIGITAL COMPUTER SYSTEMS, AND ELECTRICAL CONTROL APPARATUS FOR CONTROLLING THE OPERATION OF SUCH APPARATUS AND SYSTEM