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XII. Account of a new Paddlc-m\eel,in xx:hichthe Motion is 

 obtained bij means of an eccentric fixed Crank a?id Levers. 

 Invented bi/ King Williams*. 



With an Engraving. 



A REPRESENTATION of this paddle-wheel and some 

 '^*- of its parts in detail is given in the accompanying drawing. 

 (Plate I.) Fig. 1. is the end-view of the frame and paddles. A 

 is a cast-iron centre-piece or bosh, which receives the wrought- 

 iron arms 1, 2, 3, 4. B is the fixed crank; C the collar re- 

 volving upon it, bearing the connecting rods 9, &c. as also 

 shown at T in fig. 3. H shows the angle made by any one 

 of the paddles when the wheel is in that position ; and when 

 it arrives at the dotted lines F, just entering the water, it 

 makes an obtuse angle with its axis (see G), so that the pad- 

 dle acts with a propelling power the instant it enters the wa- 

 ter, without any loss of power whatever ; and when F arrives 

 at E, it has the greatest power, and its lever and rod 9 make 

 an angle best adapted to resist the pressure of the water at E. 

 When E arrives at the dotted lines D, it leaves the water in a 

 direction nearly perpendicular to its surface. 



Fig. 2. 8 is a view of one of the paddles, showing part of 

 the double frame m m : 1 the horizontal spindle which connects 

 the two frames together ; the fulcrum of the paddle being be- 

 tween the shoulders of the spindle I and the frames m vi, but 

 move freely. J is a screw on the paddle-spindles ; the nut K 

 serves to screw the four angles all fast together. 



Fig. 3. 71 is the revolving collar working on crank C, fig. 1, 

 ■with its major-rod. T is the same turned down, to show how 

 the other rods are connected. U is a brass bush to fit the 

 crank bearing z, fig. 4. P one of the bolts fitting into L, 

 fig. 2. 



Fig. 4. The fixed crank, and part of frame m m. R the 

 engine-shaft. W the engine-crank. X and Y bearing the 

 part 6, go into 6 of frame m, and are there keyed fast. The 

 pivot 5 goes into hole 5 of the fixed crank, and there revolves 

 freely, carrying with it the whole of the frame. The part of 

 the other frame represented at 7 bearing on O, the crank is 

 there set fast by a strong screw, but can be moved so as to give 

 a different angle to the paddles. 



This plan for a paddle-wheel was first invented by me for a 

 ship of war, to work in midships, as it does away with the 

 back-water. But the principle is well adapted to any steam- 

 vessel. It has been tried on a large scale in the Mediterranean, 



• Communicated by the Author. 



in 



