. A sketch of the origin and progress of steam navigation from authentic documents. IJJ Q£O- ?uJa:oCO I I ^ UJ 00 <a. § ,to OofO aoo 5: 0£ aCO STEAM NAVIGATION. 121 propulsion of the ship; and if she had then to go against a head-wind, such wind would be an impediment to her progress, and thecourse (or fast) pitch of the screw would prevent the engines frommaking the full number of strokes per minute, and consequently aportion of their power would be lost; so that if the pitch of the screwwere reduced to the degree which allowed the engines to make theirfull number of strokes per minute
. A sketch of the origin and progress of steam navigation from authentic documents. IJJ Q£O- ?uJa:oCO I I ^ UJ 00 <a. § ,to OofO aoo 5: 0£ aCO STEAM NAVIGATION. 121 propulsion of the ship; and if she had then to go against a head-wind, such wind would be an impediment to her progress, and thecourse (or fast) pitch of the screw would prevent the engines frommaking the full number of strokes per minute, and consequently aportion of their power would be lost; so that if the pitch of the screwwere reduced to the degree which allowed the engines to make theirfull number of strokes per minute, they would then, on the contrary,be exerting their full power. The object, therefore, of this screw, is to enable the engines to giveout their full effect under all the varying circumstances of wind, cur-rent, tonnage, and the other conditions which affect the progress of avessel through the water. It might also be made to act upon theengines by intermediate machinery, and thus to regulate their speedunder the circumstances already mentioned, by the aid of governors,such as
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Keywords: ., bookcentury1800, bookdecade1840, bookidcu3192403090, bookyear1848
