Word: disks
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Dates: during 1930-1939
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...Inside, protected by close-packed felt and rubber, was the biggest and costliest piece of glass in the world - the 200-in. telescope mirror destined for California Institute of Technology, 3,000 miles away. For nearly a year, since it was formed of molten pyrex borosilicate glass, the great disk had cooled slowly in its annealing oven. In the testing plant it had been pronounced fit for its job. 'Now it was ready for shipment. It weighed 20 tons, its complicated packing case 15 tons more. The trailer which brought it to the rail spur had taken 30 hours...
...m.p.h. Since it was impossible to provide a lateral clearance of 18 ft., the mirror had to be shipped standing upright. This raised the problem of overhead clearances. After much study a route was worked out with the tightest squeeze a three-inch bridge clearance at Buffalo. The big disk goes by New York Central to Cleveland; by Cleveland, Cincinnati, Chicago & St. Louis to St. Louis; by Chicago, Burlington & Quincy to Kansas City; by Atchison, Topeka & Santa Fe to Pasadena, Calif. There in Caltech's laboratories, where a huge grinding machine has been set up, it will spend some...
...marred during the casting when cores broke loose from the floor of the mold and floated to the top of the molten glass (TIME, April 2, 1934). Rather than grind out the huge pockmarks in the mirror's back, the Corning physicists decided to cast a new disk.* Second time the cores stayed in place...
...ever, it will emerge. Six years ago television seemed just around the corner. Jenkins Television Co. was actually selling receiving sets for $119. Now Dr. C. Francis Jenkins is dead, and his company is defunct. The Jenkins sets were made for programs televised by mechanical scanners - rapidly revolving disks with holes or mirrors to juggle the scanning beam. The Farnsworth and RCA-Victor electronic scanners made junk of disk sets. Now, before jumping into television, the radio industry would like to be sure that another technical advance would not similarly scuttle the public's investment...
...oval disk of half-polished marble bearing several small bumps and a deep groove...