Electrical news and engineering . Portion of Glass Kooni—Canadian Tungsten lactory the first operation with the glass is the forming of thestems and leading-in wires. This is done by four opera-tions practically at once, the leading-in wire with platinumconnections being welded into the glass and the glass an-chor added. The next operation is the making of the vari-ous buttons on the glass supports and adding to the sup-port the hollow cane tube which is a portion of a patenteddevice for adjusting the tension on the filaments. The fila-ments, after being mounted and welded, are taken to thesea
Electrical news and engineering . Portion of Glass Kooni—Canadian Tungsten lactory the first operation with the glass is the forming of thestems and leading-in wires. This is done by four opera-tions practically at once, the leading-in wire with platinumconnections being welded into the glass and the glass an-chor added. The next operation is the making of the vari-ous buttons on the glass supports and adding to the sup-port the hollow cane tube which is a portion of a patenteddevice for adjusting the tension on the filaments. The fila-ments, after being mounted and welded, are taken to thesealing machine, which automatically seals two lamps at. Finishing Room—Canadian Tungsten lartory a lime (any size lamps from 3 watts to vv;\tls). ;\l-lached tn this machine is an annealer for cooling the im-mense seals on the large bulbs used for the higher , ihus preventing the glass cracking or breaking. Tile exhausting department, where both carbon andtungsten lamps are pumped, is a spacious room, being 150feet liiMg by 50 feet wide. On one side are the carbon THE ELECTRICAL NEWS pumps, familiar to most of our readers, having a capacityof about 15,000 lamps per day. On the other side are thetungsten pimips. On each tungsten bench, in addition tothe devices for absorbing all gases and moisture there aretwo vacuum pumps. The linishing vacuum is made on amercury pump, the lamps leaving the pumps at a vacuumof .00001 mm. of mercury—this high vacuum ensuring longlife and greatly minimizing any liability of blackening. Thelamps are then taken into the finishing room, supplied alongone side with photometers for accurate
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