BUILDING AND OKNAMKNIAL STONE.S. 



321 



ii:-e<l in jiettiD^- out (liiiionsiou sloiic. Fii;uios oi' (Ik\si' aw ;iIso hero, 

 j^iveu. Tlie drill :iiid cyliuder arc attaclicd to the horizontal bar bv 



Eclipse, Hock Drill 



■iS"iii:iiil"l'lrlllii'ii|ilihi" iiliill I 'I! ■'" ':\\ i 'M •.■ .,iii,.|i || 'iii .i, li li il i-;.!i«i 

 Iiiijirovcil Quarry Dar. 



moans of a clauip, which can be loosened or lightened at will. IJy this 

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

 the bar and without moviu"' the entire nuichiue. 



(2) CHANNELING MACHINES. 



The channeling machine shown on page 312 was invented by George 

 J. Wardwell, of Eutland, Yt. The lirst successful machine was built by 

 him in 18G3, in connection W'ith the Sutherland Frills Marble Coiiii)any, 

 and that original macliine lias been at work there constantly until within 

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

 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 csscutially 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 live cutters, two ha\o diagonal edges ; 

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

 lar^jGst extends lowest, so that the live form something like a stejiped 

 n. Mis. 170, pt. 2 21 



