Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . strips across the frame. These were laid in layers of G in., alternately crosswise and lengthwise,until they reached above the tops of the pins. Strips of about 40 ft. in length, after having beenbored to correspond with the upper ends of the pins, were placed across the mattress, pressed down with levers, and securedwith wedges. Thus com-pleted, each mattress waspulled oil the ways by atug-boat ami towed to itslocation on the line of thejetties, where it was sunkby weighting it
Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . strips across the frame. These were laid in layers of G in., alternately crosswise and lengthwise,until they reached above the tops of the pins. Strips of about 40 ft. in length, after having beenbored to correspond with the upper ends of the pins, were placed across the mattress, pressed down with levers, and securedwith wedges. Thus com-pleted, each mattress waspulled oil the ways by atug-boat ami towed to itslocation on the line of thejetties, where it was sunkby weighting it with cross-section of thefinished jetty is shown inFig. 2488. A mattress 2ft. thick and from 35 to COft. wide is laid on the barfor a foundation. On thisthe other courses are laid, of less width but usually the same thickness, each course being sunk andsecurely held in place by rock. When the slope of the bed between the jetties becomes formed tosuit the new cross-section, and when the edge of the foundation mattress drops down to meet thisslope, another mattress is laid on the slope and acruinstthe
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Keywords: ., bookauthorbenjaminpark18491922, bookcentury1800, bookdecade1880
