342 



NEGRETTI AND ZAMBBA, HOLBOEN VIADUCT, E.G., 



FIG. 1630A. FIG. 1630s. FIG. 1630c. 



1618 T or Drawing Squares, Mahogany, with Ebony Edges : & B . a. 



42-inch 10 6 



48-inch 12 6 



54-inch 15 



1619 T Squares, Mahogany, with shifting bevel and clamp, 



best (fig. 1619) : 



18-in. 24-in. 36-in. 42 -in. 



5s. 6d. 7s. 6d. 10s. 12s. 



1620 T Squares, Ebony, plain : 



18-in. 24-in. 36-in. 



6s. 6d. 8s. 6d. 13s 6d. 



1621 T Squares, Ebony, with shifting bevel and clamp : 



18-in. 24-in. 36-in. 



8s. 6d. 10s. 6d. 15s. 6d. 



1622 Steel T Squares, per inch . 008 

 16^3 Steel Triangles'. various 



1624 Steel Straight-edges, stout best, per foot ... 046 



1625 Ditto ditto flexible, per foot . 030 



1626 Ditto ditto best London make, 2 inches wide, in 



Pine Case : 



42- in. 52-in. 



24s. 1 12s. 6d. 



O 



FIG. 1627. 



1627 Ivory, Ebony, or Boxwood Acute, Obtuse, and Right 



Angles, or Set Squares, various (fig. 1627), from Is.; 026 



1629 Mathematical Curves or Scrolls, Pear Tree Set of 12 . 



1630 Architectural Curves, 30 different forms (figs. 1630 ABC) 



Is. 2 



1631 Set of Radii Curves (fig. 1631) . . . . .110 



7 

 12 



