. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. MANUFACTURING LEAD-COVERED TELEPHONE CABLE 335 Each spool, containing two conductors, is mounted in a yoke which revolves on its own axis to give the pair twist and the two yokes are revolved around each other to give the quad twist. This is ac- complished by an arrangement of change gears from which can be ob- tained practically any length or direction of twist 30 LONG STROKE LEAD PER CHARGE I 1100 LBS. 30 SHORT STROKE 700 LBS. 220 LBS. MAX. AMOUNT I OF LEAD
. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. MANUFACTURING LEAD-COVERED TELEPHONE CABLE 335 Each spool, containing two conductors, is mounted in a yoke which revolves on its own axis to give the pair twist and the two yokes are revolved around each other to give the quad twist. This is ac- complished by an arrangement of change gears from which can be ob- tained practically any length or direction of twist 30 LONG STROKE LEAD PER CHARGE I 1100 LBS. 30 SHORT STROKE 700 LBS. 220 LBS. MAX. AMOUNT I OF LEAD I PER HOUR I 4543 LBS. 3650 LBS. 1700 LBS. Fig. 12—Schematic showing relative increase in size of lead presses Modern stranders follow the same general line as the older stranders but the whole design has been reviewed in detail with the view of strengthening and perfecting, and improved tension devices have been developed consisting of a tension arm actuated by the pair which in turn applies a brake to or removes it from the reel head. These are adjusted to give a tension of about three pounds per pair which causes no stretch and prevents over-running. With these, it is possible to run very fine wires at a minimum tension with a maximum smoothness of operation. The drums are gear driven and are capable of running up to 100 After stranding, the cores are dried under vacuum to remove the moisture from the paper and then are covered with a lead alloy sheath. It is necessary after the cable is removed from the vacuum drier to keep it in an atmosphere of a low moisture content until the lead sheath is applied. This was formerly accomplished by placing it in an oven. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original American Telephone and Telegraph Company. [Short Hills, N. J. , etc. , American Telephone
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
