XVIII BULLETIN 42, UNITED STATES NATIONAL MUSEUM. 



PLATE XXX (Page 224). 



Slate picking. — Boys and disabled men at the Ellangowan colliery, Shenandoah, 

 Schuylkill County, Pennsylvania, engaged in picking pieces of slate and bony coal 

 from the broken material as it descends the chutes from the breaker to the pocket-;. 



(Cat. No. 59018, U. S. N. M. From photograph.) 



PLATE XXXI (Page 222). 



COAL. 



Coal breaking. — Breaker at Kohinoor colliery, Shenandoah, Schuylkill County, Penn- 

 sylvania. The coal and dirt planes are shovFu. 

 (Cat, No. 59016, U. S. N. M. From photograph.) 



PLATE XXXII (Page 228). 



COAL. 



A mule trip. — A train of mine wagons, hauled by a mule, on its way from the mouth 

 of the drift to the chutes. 



(Cat. No. 59106, U. S. N. M. From photograph.) 



PLATE XXXIII (Page 230). 



COAL. 



Group of miners. — A group of miners in their working costumes, just leaving the 

 mouth of the drift on their way home. 



(Cat. No. 59105, U. S. N. M. From photograph.) 



PLATE XXXIV (Page 232). 



Coal plane. — A loaded car descending, and an empty one ascending the side of the 

 mountain. The coal is being transported to market. The empty car is drawn away at 

 the foot of the plane by a mule. 



(Cat. No. 59104, U. S. N. M. From photograph.) 



