. Elements of technology :. and advantageous mode of action, have incommon use superseded all the rest. They consist of paddlesor floatboards attached to the arms, or spokes, of a wheel, theaxis of which is at right angles with the keel. Their commonplace is on the sides of the boat, as in the annexed figure. Fig. 10.. The outline of the floatboards, or paddles, is commonly rec-tangular, though Mr Tredgold recommends that their outer ex-tremity should be parabolic. The best position for the paddlesis in a plane passing through the axis of the wheels, but ^vhh thisposition, they strike the wate
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. Elements of technology :. and advantageous mode of action, have incommon use superseded all the rest. They consist of paddlesor floatboards attached to the arms, or spokes, of a wheel, theaxis of which is at right angles with the keel. Their commonplace is on the sides of the boat, as in the annexed figure. Fig. 10.. The outline of the floatboards, or paddles, is commonly rec-tangular, though Mr Tredgold recommends that their outer ex-tremity should be parabolic. The best position for the paddlesis in a plane passing through the axis of the wheels, but ^vhh thisposition, they strike the water obliquely in entering, and lift a 222 ARTS OF LOCOMOTION. considerable quantity on quitting it; both of which motions oc-casion loss of power. Attempts have been made to correct thisdisadvantage by various mechanical arrangements, in which thepaddles are made to enter and leave the water perpendicularly;but want of simplicity, and objections of various other kinds, haveprevented them from coming into use. It has been proposedto fix a series of paddles upon longitudinal chains, passinground wheels, and parallel to each side of the vessel. By thismode a number of perpendicular paddles would act upon thewater at once; but it will be seen, that as no more of these pad-dles can operate usefully, than are sufficien