QUARRYING. 91 



Arrangement of Quarry. The arrangement of lines of railway 

 in a quarry is deserving of careful attention. In practice, I 

 have found the most convenient arrangement, where the contours 

 of the ground and other considerations will admit of its being 

 adopted, is to lay the lines square to the quarry face, as shown 



FIG. 16. Plan showing arrangement of lines of railway in quarries. 



in Fig. 16, A, so that they follow up the work as it proceeds, 

 without disturbance or sluing. If space will not admit of 

 curves being laid in from the main line, turntables may be 

 substituted. These were used in the extensive quarries at 

 Holyhead, and worked satisfactorily. 



When lines are laid, as they often are, parallel to the working 

 face of the quarry, as at B, Fig. 16, it becomes necessary to slue 



