PLACING THE PASS NEEDLES BY MEANS OF REVOLVING SHELVES. 



RAISING THE WEIR TRESTLES. 



WEIR TRESTLES LYING DOWN. 



NEEDLE DAM AT LOUISA, KY., U. S. A. 



(To fact p. o.) 



VIEW OF PASS TRESTLES AND NEEDLES. 

 NEEDLE DAM AT LOUISA. KY., U. S. A. 



(To faca p. 330.) 



