OF DRAWING INSTRUMENTS. 



77 



FIG. 624. 



FIG. 635. 



FIG. 642. 



FIG. 669. 



FIG. 669*. 



FIG. 607. 



FIG. 609. 



Radii OP Railway Curves of the strictest precision. 



625. A SET OF FIFTY RAILWAY CUEVES in cardboard, from 5 to 110 inches radius, in 



solid mahogany case . . . . . . 220 



626. A SET OF ONE HUNDEED RAILWAY CUEVES, from 1 inch, to 25 feet radius 



in solid mahogany case ..... 4 



627. A Set of One Hundred Railway Curves, in pear-tree or mahogany, in strong 



mahogany case .... 5 15 



628. A SET OF FIFTY RAILWAY CUEVES, ditto, ditto . . 2 18 



629. A SET OF FIFTY RAILWAY CUEVES, in zinc or brass, in extra strong mahogany 



case 6 10 



630. Slopes, for railway work, set of eight, 6 inch., 9s. ; set of eight, 8 inch., 11s. 



632. Mechanical OP Ship's Curves. The Admiralty or Trinity House set of twenty- 



five, in pear-tree or vulcanite ... 110 



633. DITTO, DITTO, in brass ... 250 



634. BATTEBNS LANCEWOOD, for ship draughtsmen, set of twelve . 10 6 



PARALLEL RULES, 



EBONY (fig. 635). 



635. 6 inch. 



636. 9 inch. 



637. 12 inch. 





 

 



638. 15 inch. 



639. 18 inch. 



640. 21 inch. 



641. 24 inch. 



Rolling Parallel Rules, ebony (fig. 642) : 



Divided 

 Plain edges. Ivory edges. 



046 070 644. 12 inch. 



642. 6 inch. 



066 096 



645. 15 inch. 



060 



Plain edges. 



086 

 10 6 





 

 



Divided 

 Ivory edges. 



12 6 

 15 6 



13 6 18 



643. 9 inch. 



646. 18 inch. 



647. ROLLING PAEALLEL RULES, ebony, with brass bridges, from 6 to 9 inches 



long, per inch, Is. ; 12 to 24 inches long, per inch, lid. 



648. ROLLING PAEALLEL RULES, ebony, with brass bridges and divided edges, from 



9 to 12 inches long, Is. Id. per inch. ; 12 to 24 inches long, Is. per inch. 



