. The Bell System technical journal . Htttninii nHiuniM •H!tH|l)!!l litliHinm iiiiHittinitiiniiiiii ^ ilDIIUIilll UllllilllMI^^^BllllillltlHI IIIUIHIill ■ii u * ^ ^i IRE ASSEMBLIES ^^^ ^^IV ^^^ ^^V. Fig. 7—A few varieties of the coded parts used to obtain various contactcombinations. NEAV GENER.\L PURPOSE RELAY 1033 By using dilTerent coinhiiuit ions of stal ionaiv and 1 win w iic assemblieswith each card variety, a large number of different contact combinationsmay be obtained. While most of these needed for telephone switchingS3^stems use either no sequences at all or a single stage of sequen
. The Bell System technical journal . Htttninii nHiuniM •H!tH|l)!!l litliHinm iiiiHittinitiiniiiiii ^ ilDIIUIilll UllllilllMI^^^BllllillltlHI IIIUIHIill ■ii u * ^ ^i IRE ASSEMBLIES ^^^ ^^IV ^^^ ^^V. Fig. 7—A few varieties of the coded parts used to obtain various contactcombinations. NEAV GENER.\L PURPOSE RELAY 1033 By using dilTerent coinhiiuit ions of stal ionaiv and 1 win w iic assemblieswith each card variety, a large number of different contact combinationsmay be obtained. While most of these needed for telephone switchingS3^stems use either no sequences at all or a single stage of sequence, aivw combinations are provided with preliminary contacts. These com-binations include two stages of sequence, in which some contacts operateat each of three different points in the armature travel. The preliminarycontacts operate earliest in the travel. These are followed by the earlycontacts of sequence transfers and finally by the late contacts, includingordinary makes and breaks. To be sure the desired sequences will be maintained during the lifeof the relays, it is necessary to provide margins in the form of armaturetravel allowances at each stage. Combinations with sequences will
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
