ium has made some advancesin Screw.—No. 5. (1838). Dugdale (1849) put several propel- 1824, placing one shaft within the other, and the woolen manufactures, which deserve to be The use of the screw propeller in China lers on the same shaft. turning the screws in opposite directions. noticed. During… … 1850, with a movable outside bearing, and by working capital. many others), and worked by men, was ap- —_++0 = Execrric CLrocks.—In Marseilles, France, plied in 1602, to the British ships Dragon and when in use; but it was soon found needful without resistance by a “donkey engine.” one hundred…
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