Method of raising large Stones out of the Earth. £15 



Society without adding a few lines concerning it. I can 

 bear ample testimony to the ease with which the largest self- 

 stones are lifted by his method. I have s?en one upwards 

 of five tons lifted by four men. One of the plugs is sent 

 for the inspection of the Society. There is no difficulty in 

 cutting the hole to receive it, the only care is not to make it 

 too large. It is difficult to explain the theory of its action ; 

 the least stroke laterally disengages the stone. In many 

 situations it is likely to be of great use, not only in drawing 

 stones out of the ground, but in ^making, weirs and em- 

 bankments, where the stones are only to be lifted a moderate 

 height. 



One of my farmers in Westmoreland has made great use 

 of one, and speaks of it in high terms. I have exhibited it 

 to' numbers of persons, who could not believe its power till 

 they saw it tried. 



Mr. Richardson submits its examination to the Society, 

 and I conceive it will be very useful and beneficial in cases 

 of new inclosures of land. I dp not think it would answer for 

 soft stones, or be safe to use for raising stones in buildings, 

 it being so easily disengaged by any lateral blow. By adding 

 wheels to the tackle machine, or having it upon a sledge, a 

 great deal of time and trouble would be avoided. I purpose 

 to employ this method next summer in making an embank- 

 ment against the sea; the facility it will give in raising and 

 removing large stones, will expedite the work greatly. If 

 any further certificates of the performance of this phi? be 

 required by the Society, T will with pleasure transmit them 

 to you. I will answer for it§ extracting any stone not ex- 

 ceeding five tons weight out of the ground, without any 

 previous moving of the earth ; and it is of importance to 

 preserve large stones entire. 



I am, with respect, dear sir, 



your obedient humble servant, 



Workington Hill, J, Q. ClJRWEN, 



Feb! 19, 1S08. 



To C. Taylor, M.D. Sec. 



4 SIR, 



