A finely engineered brass and steel model of the twin cylinder horizontal trunk engine fitted to the U.S. Navy Monitor 'Monadnock' of circa 1862 designed by Captain J. Ericsson and modelled by G.A. Dimelow Measurements overall -- 4½ x 6¾in. (11.5 x 17.2 cm)

Details
A finely engineered brass and steel model of the twin cylinder horizontal trunk engine fitted to the U.S. Navy Monitor 'Monadnock' of circa 1862 designed by Captain J. Ericsson and modelled by G.A. Dimelow Measurements overall -- 4½ x 6¾in. (11.5 x 17.2 cm)
With cylinders 1 3/16in. bore x 13/16in. stroke, integral stop valve, eccentric and rocking lever operated valves, studded stuffing boxes, round connecting rods and centrally mounted crankshaft. Finished in blue, grey and polished brightwork, wood mount and display base

cf. BOURNE J. A TREATISE ON THE SCREW PROPELLOR.

See Illustration

The U.S.S. Monadnock, one of the 4 'Miantonomoh' class monitors was launched 23.3.1864 and commissioned into the Union Navy on 4 October the same year. Displacing 3,400 tons and measuring 258½ feet in length with a 52¾ foot beam, her wooden hull was protected by 5-ins. iron plating and she was armed with 4 15-ins. smooth bore guns. Powered by Ericsson Vibrating Lover engines, her 4 Martin boilers and twin screws gave her a cruising speed of 9-10 knots.

The only vessel of her class to be completed in time to take part in the Civil War, she fired 441 shots without loss during the bombardment of Fort Fisher in January 1865 and she also saw service in the James River. During the winter of 1865-66 she sailed to San Francisco via Cape Horn, a remarkable achievement for a monitor given the severe limitations of their design. De-commissioned in June 1866, and broken up at Mare Island in 1882.
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