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Updated: May 16, 2025
For he had to open and shut each pair of gates single-handed, using a large iron key to lift and close the sluices; and, moreover, Mr. Mortimer, though he did his best, was inexpert at guiding the boat into the lock-chamber and handling her when there. A dozen times Sam had to call to him to haul closer down towards the bottom gates and avoid fouling his rudder.
In order to move the lock-chamber up and down and to sustain it constantly in a horizontal position, nuts have been fixed to strong crossbeams, through which powerful screw-rods work.
For the modern engineer there are, however, no insurmountable obstacles. Instead of a line of ordinary locks, a single structure was erected sufficient for the needs of the entire region. This lock is situated at Henrichenburg, near Dortmund, and our illustration pictures it with its lock-chamber half raised.
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