It is attached to a copper ribbon, B, whose
other extremity is fixed to the drum, T. The ribbon winds around the
latter in the rising motion of the float, owing to a spiral spring
arranged so as to act upon the drum. The tension of this spring goes
on increasing in measure as the float descends.
[Illustration: FIG. 1.--FLOAT OF SIEMENS AND HALSKE'S MARIGRAPH.]
[Illustration: FIG. 2.]
This difference in tension is utilized for balancing at every instant
the weight of the ribbon unwound, and thus causing the float to
immerse itself in the water to a constant degree. The ribbon, B, is
provided throughout its length with equidistant apertures that exactly
correspond to tappets that project from the circumference of the
wheel, R. When the float moves its position, the wheel, R, begins to
turn and carries along in doing so the pinion, w, which revolves
over the toothed wheels, s1, s2, and s3. The thickness of w
is equal to that of the three wheels, s1, s2, and s3, and a
special spring secures at every instant an intimate contact between
the pinion and the said wheels.
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