gQg MACHINE FOR TAKING LARGE STONES OUT OF THE GROUND. 



plug, and, in justice to the inventor, am happy in thua 

 vouching tor its extreme usefulness. Several of my respect- 

 able neighbours have experienced the aid and benefit of the 

 above instrument, and will vouch, if required, for the truth 

 of the above statement. 



I am, Sir, 



Your truly obedient Servant, 



ROBERT WRIGHT* 

 Rose Gill Hall, near Shop, West- 

 morelandt May 9i 1^08. 



Reference to the Engraving of Mr. Richardson's Invention 

 for raising large Stones out of the Earth, See PI. VI, 

 Figs. 4, 5, 6, and J. 



The method F'^- 4, K, shows the upper part of a stone nearly buried 

 described. Jn the earth, having a hole made in it three inches and a 

 half deep, and one inch in diameter, by means of a miner's 

 juuipev ; the cylindrical tail of the plug a, figs. 5, 6, and 7, 

 which is of the same size, is driven fast into it, by means of 

 a hammer applied upon the head of the plug at G. This 

 plug, in its whole length, is nine inches, and has a hole 

 made in its broad part H, through which the oval iron ring 

 B passes easily, and on which the plug can move backwards 

 and forwards, when the ring is hung upon the hook of the 

 lower pulley block of thd lifting tackle. C C C C represent 

 the four legs or frame work of the qurdrangle ; D a five- 

 fold tackle, with blocks ten inches in diameter; E a roller 

 seven inches in diameter, turned by two long iron levers 

 b b ; the handle I is used as a safeguard, and to assist to re- 

 gulate the power of the levers. In fig. 4, the plug A is 

 shown fixed in the stone K, ready to draw it out of the 

 ground, by raeuns of the lifting tackle- 



N.B. The hinder legs of the quadrangle are made to close 

 in between the fore legS, for the convenience of carriao-e. 



VI. 



i 



