46 PARTICULARS OF THE CONSTRUCTION &C. 



windlasses, &c. ; on the 12th of that month the first 

 stone was laid ; and the first course completed on the 



Cul USL 1M : 



13th. As they were subject, of course, to the same 

 interruptions from the weather, there was now a new 

 difficulty to contend with. Rough weather coming on 

 suddenly might not only drive the workmen off the 

 rock, but destroy all they had done, and wash over the 

 stones into the deep water. 



To provide against this, chains were always carried 

 out, to confine their machines, &c., in case of emer- 

 gency ; and a hemispherical weight of lead of 5 cwt., 

 to place upon any stone they might be obliged to leave 

 unfixed. But every stone was fixed in the following 

 manner, before another was laid upon it. Grooves 

 3 inches wide and 1 inch deep were cut down the sides 

 of the stone where they came into contact; and through 

 each stone two holes were bored. These preparations 

 were made at the work yard, where the stone was also 

 exactly fitted to its place, as will hereafter appear. 



To be resumed in our next number. 



