78 



L. CASELLA'S CATALOGUE 



FIG. 656* 



FIG. 656. 



649. EOLLING PARALLEL EULES, brass, from 6 to 9 inches long, per inch, Is. lOd. ; 



from 12 to 24 inches long, with lift screws, per inch, Is. lOd. 

 *#* The above (649), with divided edges, the figures engraved, 6d. per inch extra. 



650. EOLLING PABALLEL EULES, German silver, from 6 to 9 inches long, 2s. 8d. per 



inch ; from 12 to 24 inches long, with lift screws, 2s. 6d. per inch ; if with 

 divided edges, 4d. per inch extra. 



652. Captain Field's Parallel Rule, an improved and simple means of setting off ship's 



courses and bearings on charts, with instructions. 



15 inch. 18 inch. 24 inch. 



076 096 13 



CAPTAIN FIELD'S IMPBOVED EOLLING PABALLEL EULE, engine divided to degrees 

 and compass points : 



Brass. German Silver. 



653. 12 inch. . . . . 200 2 15 



654. 18 inch. . . . . 2 15 350 



655. CAPTAIN TOYNBEE'S IMPBOVED PABALLEL EULE 110 



656. 18 inch. 



657. 24 inch. 



658. 27 inch. 



*#* The above sizes, in mahogany, with plain heads, one-third less in price than the ebony, 

 the material the very best seasoned and only one kind. 



T DBA WING SQUABE, with mahogany angular blade, solid ebony edges, double 

 rabitted, and screwed on : 



663. 18 inch. . 030 665. 36 inch. . f . 070 

 663* 24 inch. . . 046 666. 42 inch. . , . \ 080 



664. 30 inch. . . 056 667. 48 inch. . . 10 6 



668. 60 inch 16 6 



This plan allows the set square to pass over the head and the edge o f the drawing board, it 

 is very strong, easily repaired, and has been more commended than any other kind of square. 

 669. Angles and Set Squares, in every variety, from 3s. 6d.per doz. (fig. 669, 669*), 

 p. 77. 



