GLASGOW DOCK. 



211 



Cope Leoel 





the outer side walls were built. These walls (Figs. 199, 200) 

 were constructed of brick in cement, 37 inches thick at the 

 bottom, stepped off on the inside to 18 inches at the top, the 

 outside face being plumb, and carefully pointed to secure 

 water-tightness. 



Except the side walls of the entrance, the steps, timber 

 slides, top altar course, and coping the whole of which are of 

 granite the body of 

 the dock is con- 

 structed of concrete, 

 and was, except the 

 altar courses, de- 

 posited in situ within 

 movable frames. The 

 altar courses are 

 formed of granolithic 

 blocks which were 

 moulded on a plat- 

 form, and when tho- 

 roughly set were built 

 into the work like 

 ashlar stones. An exception was the bottom altar course, which 

 was made in situ in 8-feet lengths, and in alternate blocks, 

 to allow for shrinkage in setting. This lower altar was made 

 14 inches on the tread and 30 inches average rise, the remainder 

 being 14 inches tread and 18J inches rise. 



The semicircular head of the dock was formed of brick in 

 cement, stepped at the back, and having rectangular voids filled 

 with concrete ; the whole faced with granolithic-concrete 

 ashlar, battered to one inch per foot, in courses 18 inches deep, 

 and chamfered on the top and bottom edges. The stretchers 

 were made 4 feet by 1 foot 9 inches on the bed, and the headers 

 3 feet 6 inches long by 2 feet on the bed. 



On each side of the dock there are two sets of steps, and 

 four timber slides. Each set of steps is 4 feet 6 inches wide, 

 with landings about halfway down, approached from the 

 surface by two flights of steps which are placed parallel with 

 the dock (Figs. 196, 197). The steps are 12 inches on tho 

 tread, and f>i inches rise. 



The chamber for the reception of the caisson for closing the 

 entrance is shown by Figs. 191, 192, 193. The side and 



