File:Operation and adjustments of the automatic three wire telephone (1915) (14569437908).jpg

Identifier: operationadjustm00deck (find matches)
Title: Operation and adjustments of the automatic three wire telephone
Year: 1915 (1910s)
Authors: Decker, Benjamin Harrison
Subjects: Telephone Theses
Publisher:
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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Text Appearing Before Image:
ost is very important. In perfect adjustment the two shouldmake contact when the front edge of cam tooth and front edgeof spring are flush. This arrangement gives a period of contactequal to the time it takes the cam tooth to slide along and offof spring shoulder. If the contact is made before the two edgesare flush the contact is too long end a so called heavy impulseis given to the switch in the exchange. If contact is made afterthe edges pass, the contact is of too short a duration. Thisgives a light impulse. As the switches in the exchange areadjusted for certain timed impulses, it is very important thatthe instrument impulse adjustment be for a corresponding durationof time. The rotary impulse spring has the reverse position of thevertical spring as concerns the shoulder. The two springs areidentical with the above exception and the added exception thattheir platinum contact points are on opposite sides. For eachrotation of the dial the rotary impulse spring is brought in • 24-
Text Appearing After Image:
Fig. 6. Release, Talking and Lockout Springs. Party Line Telephone. ±,-VerticalRaieosa Spnn^. 3r frame Spring 4. - Tfllkm^ Springs. 5. -Lockout 5^rln5S. /fofo, E/ecf. Co. Fr/fit. .3 pil -25- contact with the ground post only once. This feeing the case itis not necessary that its adjustments he so accurate, as withthe vertical impulse springs. However the contact with theground post should be as long as possible, and for this reasonthe rotary impulse spring in normal position is placed closer tothe ground post than in the vertical impulse spring. E. Governor and Gear Wheel. The governor works in conjunction with the dial spring,and regulates the speed and period of impulses. A short descrip-tion of the construction, and explanation of principle willprobably be helpful in understanding its operation. Figure 7shows the front and rear views of the governor assembly. The governor works on the same principle as the fly balltype of engine governor. Two half disks are hinged to a crossplate

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