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''Jennie Clark'', also seen spelled ''Jenny Clark'', was the first sternwheel-driven steamboat to operate on the rivers of the Pacific Northwest, including British Columbia. This vessel was commonly known as the ''Jennie'' when it was in service. The design of the ''Jennie Clark'' set a pattern for all future sternwheel steamboats built in the Pacific Northwest and in British Columbia. ==Design and construction== Jacob Kamm and John C. Ainsworth built ''Jennie Clark'' at Milwaukie, Oregon in 1855. ''Jennie Clark'' was the first sternwheeler built in the Pacific Northwest.〔〔 The hull and upper works were built at Milwaukie, while her engines were built in Baltimore to Kamm's specifications, for a price of $1,663.16, and shipped around to the West Coast, which cost another $1,030.02.〔 Kamm and Ainsworth had settled on the sternwheeler as superior to propeller-driven and side-wheel boats.〔 Propellers were too vulnerable to expensive damage to propellers and shafts from rocks and other obstructions in the river.〔 Sidewheelers were too difficult to steer and needed expensive dock facilities.〔 ''Jennie Clark'' was 115 feet (or 118 feet), measured over the hull, which excluded the extension of the main deck over the stern, which mounted the sternwheel.〔 The width of the vessel, called “beam” was 18.5 feet measured over the hull and excluding the extensions, called the “guards” running along the top of the hull.〔 The depth of hold was 4 feet.〔 The boat was built with a very light draft and was specifically designed for the route on the Willamette river from Portland to Oregon City.〔 There was a single cabin built on the hull, with the boiler in the middle〔 The passenger cabin was located forward of the boiler, even though Kamm would have preferred the cabin to have been placed somewhere else.〔 On top of the main cabin was the pilot house, from which the vessel was steered. The smokestack was behind the pilot house.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Jennie Clark」の詳細全文を読む スポンサード リンク
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