42 



PROCEEDINGS COTTESWOLD CLUB 



1912 



work, a lo-ton crane is erected in such position as to command the whole 

 face. These cranes are now constructed telcscopically, so as to accommodate 

 them to slight variations in the headings, arising from differences in the 

 depths of the valuable beds, and the expense otherwise attendant on frequent 

 alteration of the crane is thus avoided, and the periodical shifts from old 

 worked-out to new localities arc effected with less troulile and loss of time. 

 After a block of freestone has been loosened in situ, a lewis bolt is let into 

 the face of the block, the chain of the crane attached to it, and the block is 

 then drawn out horizontally. By the removal of the first stratum a sufficient 



Fig. 3. — Crane removinR a block of stone from the face of the underground quarrj'. 



space is obtained to allow the workmen an entrance under the roof ; and 

 vertical cuts arc again carried through the next -bed to the parting below, 

 and transverse cuts readily made ; meanwhile the cutting is continued in the 

 picking bed, the upper layer removed as before, and everything below this 

 point quarried away, with all the sides of the block sawn, except the bed on 

 which it has rested, and those abutting on the natural joints. Hence each 

 block comes out ready to pass into the hands of the mason and builder." 



From the quarry the Members motored back to Bath and caught the 

 4.35 p.m. train (M.R.) 



