7, winds around the drum, P, and receives its motion from
the cylinder, W. This sheet is covered throughout its length with fine
prepared paper that permits of taking the imprints by impression.
[Illustration: FIG. 5]
[Illustration: FIG. 6--RECEIVER OF SIEMENS AND HALSKE'S MARIGRAPH.]
[Illustration: FIG. 7]
This stated, the play of the apparatus may be easily understood. Every
ten minutes a regulating clock closes the circuit of the local pile,
B2, and establishes a contact at C. The electro-magnet, E4,
attracts its armature, and thus acts upon the lever, h, which
presses the sheet of paper against the stylet in front that serves to
mark the level of the lowest waters, and against the stylet, g, and
the wheels, T and Z. In falling back, the lever, h, causes the
advance, by one notch, of the ratchet wheel that is mounted at the
extremity of the cylinder W, and thus displaces the sheet of paper a
distance of 5 mm. The wheel, Z, carries engraved in projection upon
its circumference the hours in Roman figures, and moves forward one
division every 60 minutes.
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