Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 185
e Return Spring. The tension of the carriage return spring can be in-creased by turning the screw in the center of the spring barrel clockwise and can be de-creased by operating the escapement lever (Fig. 44). The tension of this spring shallbe just sufficient to return the carriage smartly to the… … Fig. 44 34. Carriage Buffer. With the carriage return spring adjusted to about its propervalue, the adjusting screw which regulates the air outlet of the pneumatic buffer shallbe regulated so that the action of the buffer will take up the impact of the returningcarriage, but still not cause the…
Telegraph
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