32 ANNUAL OF SCIENTIFIC DISCOVERY. 



carry over less water, and here also there would be a saving of power 

 or a gain in speed. The above results, obtained by Mr. Ewbank, are 

 very surprising, and it is to be hoped that our mechanics, in their 

 striving after a six days' passage across the Atlantic, will not over- 

 look his suggestions. 



NEW VERTICAL-DIPPING PADDLE-WHEEL. 



MR. JOHN MILLS, JR., of Springfield, Mass., has invented a new 

 paddle-wheel, which so operates the paddles as to make them dip ver- 

 tically in the water, and then leave it in a vertical position. The pad- 

 dles therefore move on axles, and are allowed by their own gravity to 

 swing free while not in the water, but at the moment they enter the 

 water vertically, (which they will do on a perpendicular line with the 

 centre of gravity), a stout arm on each side grasps the outer side of 

 the paddle and holds it firm while it is passing through the water, and 

 then releases it, so as not to raise any back water. These stout arms 

 to do this are secured on the radial arms of the wheel, and are oper- 

 ated by having their ends revolve in a groove of a stationary eccentric 

 cam, secured around the shaft of the wheel. The groove in the 

 cam guides the arms that grasp and retain the paddles, to catch and 

 let go the paddles at the exact point required. Scientific American. 



LARGE WATER-WHEEL. 



A LARGE wheel has been manufactured at the Union Works at Pat- 

 erson, for Don Rubio, capitalist and manufacturer in Mexico, for his 

 factory at Queretaro. It measures 66 feet in diameter, or 200 feet in 

 circumference, being the largest wheel in the w y orld, except one in 

 Scotland. It has 169 buckets, 9 feet long, and its weight, including 

 the cog-wheels for regulating the speed, is near 200 tons ! It will 

 make two entire revolutions per minute, and its power is that of 100 

 horses. 



NEW PADDLE-WHEEL. 



THE wheel is the invention of a Mr. Tingle, of New York. The 

 paddles are of sheet-iron, and instead of being fixed at right angles to 

 the arms of the wheels, consist of two parallel plates vertical to the 

 water, and so contrived, that when the paddle enters the water it as- 

 sumes the form of a bucket, or of the covers of a book open at an 

 angle of 40 degrees ; the plates move upon a pivot, and as the pad- 

 dle rises from the water, the plates again become parallel, and the 

 water escapes. 



The advantage of this wheel is, that the power is effectually exerted 

 at the right point, and that it lifts no water when rising, which is the 

 great objection to the ordinary paddle- \vheel. A trial has been made 

 which was quite satisfactory. The wheels were properly adapted to 

 a boat 32 feet long, and worked by two men, with a crank and band. 



