BUILDING AND ORNAMENTAL STONES. 



321 



used in getting out dimension stone. Figures of these are also here 

 given. The drill and cylinder are attached to the horizontal bar by 



I 



jltfc 



ill 



Eel ipso llock Drill. 



, 1 ■■■ ' ' 

 Improved Quarry Bar. 



means of a clamp, which can be loosened or tightened at will. By this 

 means a dozen or more holes can be cut by simply sliding the drill along 

 the bar and without moving the entire machine. 



(2) CHANNELING MACHINES. 



The channeling machine shown on page 312 was invented by George 

 J. Ward well, of Eutland, Vt. The first successful machine was built by 

 him in 18G3, in connection with the Sutherland Falls Marble Company, 

 and that original machine has been at work there constantly until within 

 a few months (1885). These machines are now in operation in all 1 he 

 important quarries of sandstone, limestone, and marble in the country, 

 and it is calculated that over 5,000,000 square feet have been cut by 

 them. The channeler is essentially a locomotive machine driven by 

 power, usually steam, moving over a steel rail track which is placed on 

 the quarry bed. It carries a single gang-drill on one side, or two such 

 drills — one on each side. These are raised and dropped by a lever and 

 crank arrangement. The gang of cutters forming the drill is composed 

 of five steel bars, 7 to 14 feet in length, sharpened at the ends and se- 

 curely clamped together. Of the five cutters, two have diagonal edges ; 

 the other three have their edges transverse. The center of the middle 

 largest extends lowest, so that the five form something like a stepped 

 H, Mis. 170, pt. 2 2X 



