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SURVEYING, MARINE AND SUBMARINE.
47
are made to indicate on a counter the length of wire paid out, or to act in
conjunction with the Section Plotter.
The Section Plotter is a device for recording on paper a line of soundings
to scale, without the necessity for any intermediate bookings. By its means
a band of paper is made to traverse at right angles the track of the movable
pointer of the sounding machine at a rate proportionate to the paying out of
the distance line. Thus the pointer, the motion of which across the paper
Fig. 43.—Mechanism of Section Plotter in Sutcliffe’s Apparatur
represents the amount of rise and fall of the lead, acquires relatively to the
paper a second movement corresponding to the horizontal travel of the lead.
The pointer carries a marker, sprung just clear of the paper, and the operator,
on taking a sounding, has only to tap the marker with a finger of his right
hand in order to record the sounding on paper, by means of a dot which
denotes the position of the lead on the section plane, both vertically and
horizontally.
There are a number of ingenious details by which the apparatus is rendered