| Length | 16 feet |
| Beam | 20 inches |
| Depth | 2 feet |
MR. HOLLAND’S EARLIEST SUBMARINE.
(1875.)
It was divided into three parts; the two end ones were used as air reservoirs and submersion tanks, and that in the centre contained the operator, whose head was encased in a diver’s helmet. The vessel was driven by a small propeller projecting from the stern joist, and beneath this was the rudder.
Holland No. 2 was constructed in 1877 at the Albany City Iron Works of New York.
Its dimensions were:—
| Length | 10 feet |
| Beam | 3·5 feet |
| Depth | 3 feet |
It had a double shell, and in the space between water ballast could be admitted for submersion. The motor was a petroleum engine of 4 h.p., working a screw at the stern. Two rudders, one vertical, the other horizontal, were carried, and experiments showed that the latter acted better when placed at the stern than when on the side. After a series of trials on the Passaic River, Mr. Holland removed the machinery and sank his boat under Falls Bridge at Patterson, where it probably remains at this day.
Holland No. 3 was commenced in 1879 in the yards of the Delamater Iron Company of New York City, and finished in 1881.
Its dimensions were:—