The Maritime History of the Great Lakes
St. Ignace (Propeller), 15 Dec 1887

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Detroit.---The mammoth ice crusher St.IGNACE, to launch which an unsuccessful attempt was made at the Detroit Drydock Company's yard on Saturday, was plunged into her natural element last Wednesday. The vessel is so heavy and of such unusual construction that launching her was a work of unusual difficulty and delicacy. The craft is the only one of her kind in the world. She is built with great solidity and immense power, and it is calculated that with her forward wheel she will be able to force an opening for herself in the solid windows of ice which form next the shores in the Straits of Mackinac, and have thus far defied everything but blasting powder. The St.IGNACE will be put into drydock to receive her shafting, propeller wheels,and outside sheeting of iron. She will be rushed through for work this winter. She is designed to cross the Straits of Mackinac all winter in connection with the Michigan Central, and will have to work her way through very thick ice. She has two propellers, one forward, and one aft, and the forward propeller is expected to dislodge the ice, while the engines working the after propeller, being more powerful, will continue to shove her ahead. She is built with considerable rise of floor, which it is claimed, will assist her to break the ice. The forward propeller is 10 feet diameter and the after propeller 12 feet. She can carry ten cars, and is very strongly built of oak with metal sheting. The forward engine is desingned to indicate 1,000 horse power and the after 2,000. She has three boilers of the Scotch type, measuring each 18 feet by 11 feet 6 inches.
      The Marine Record
      Thurs. Dec. 22, 1887 p. 1

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William R. McNeil
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Maritime History of the Great Lakes
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St. Ignace (Propeller), 15 Dec 1887