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Self-re-cord′ing Lev′el.

This machine is adapted for obtaining a profile or vertical section of a line of survey by passing over the track. A gradeindicator.

The carriage traverses on wheels of known circumference, and one of these is geared to a drum, so as to rotate the latter at such a rate that a given length of the profile paper wrapped thereon will correspond to a certain distance traveled. The paper unwinds from one roller and wraps upon another, being subjected to the action of a pencil on the pendulum, which swings toward one end or the other of the drum as the carriage ascends or descends a hill, only maintaining a central position when traveling a dead-level. The drum can be shifted vertically to accord with any required scale.

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