82 



Henry Riddell on 



7. The stillard reversed. 



Because of its quaint nature this patent is illustrated here 

 by a photographed copy of the drawing accompanying the patent 

 which was issued to Harris in 1747 (No. 624). 



The word "stillard" is the same as "steelyard," and the 

 drawing is exceedingly picturesque. The inscription reads, in its 

 original spelling and punctuation, — " By the model of this draft 

 two ounces will raise so much weight in an equal space and time 

 that a thousand will not raise it ; as common and by applying a 

 waterwheel in the room of this pulley ; a perpetual motion is 

 gained from a still water ; as long as the materials will endure ; 



Fig III. — Richard's Patent, No. 1870, 1858. 

 Gravity VVhp:el, Heavy Balls. 

 agreeable to the patent granted ; and by adding more cranks ; 

 and more levers, it may be augmented to a superior force ; espe- 

 cially as I have added two wheels ; to cause a quick stroke." 



8. Schwier's wheel, patent No. 1745, of 1790. This inventor, 

 like many others, contrived ^o lift heavy balls along the vertical 



