i8o PROCEEDINGS COTTESWOLD CLUB 1913 



In 1904 this well was very wisely filled up, and a new bore- 

 hole put down by Messrs Thomas Tilley & Sons, of London. 

 This new bore-hole was intended to be 18 inches finished 

 diameter, but it was found necessary to line it to a greater 

 depth by a second lining i6| inches diameter, as mentioned 

 below. 



On page 183 will be found details of the rocks passed 

 through, but these will be discussed shortly (page 183). 



When a depth of 181 feet below the present engine-room 

 floor was reached (and the end of the bore-hole was still in 

 the Great OoHte) , a temporary pump was put down to test the 

 yield of water. It was found that it was not equal to 1,000 

 gallons per hour. Consequently, it was decided to put down a 

 small i-inch diamond-boring to a further depth of 50 to 60 feet 

 from the bottom of the bore-hole. The experiment proved 

 satisfactory, so the boring was continued to a depth of 267 feet, 

 but this time with a 6-inch-size calyx-borer, so that cores were 

 drawn. 



The bottom of the Great Oolite limestone was reached at 

 260 feet below the engine-room floor (102 feet above O.D.) 



Representative pieces of these cores have been kept (see 

 page 183). 



Afterwards the bore-hole was enlarged by percussion- 

 boring with chisels. From 6 feet down to 135 feet it was lined 

 with cast-iron pipes having an internal diameter of 18 inches. 

 Through these pipes were thrust wrought-iron pipes (with an 

 internal diameter of 16^ inches) to a depth of 195 feet 2 inches. 

 From 195 feet 2 inches to 259 feet the bore-hole was enlarged to 

 12 inches and left unlined, or " open ; " while the 6-inch bore- 

 hole from 259 to 267 feet was left uninterfered with and un- 

 lined. 



In 1905 the building of the present pumping-station was 

 completed. 



The yield of the 1904 bore-hole is 16,700 gallons per hour, 

 and of the 1890 bore-hole 10,000 gallons per hour. 



