"Travelling cranes were so arranged, as to take the largest pieces from the wharf, and place them in the various machines, by the agency of a very few men, notwithstanding their formidable dimensions; the heelposts in some cases being upwards of 34 feet long. Each endless screw, for giving progressive motion to the cutting tools, was 45 feet long. Some idea may be formed of the manual labour avoided by the machines, when it is stated, that the surface planed or turned in the nine pairs of gates equals 717,464 square inches; and in some cases a thickness of three-quarters of an inch was cut off. The surface in the drilled bolt holes equals 120,000 square inches."
The paper gave all the details of the construction of the gates, and the machinery for making them; and was illustrated by a series of detailed drawings.