Mathematical Injlruments. 5 
points at once, from a map or any drawing to 
another copy. 
17 A pointrel and feeder, having at its upper end 
an oval plate for clearing the drawing pen of 
any dirt or grit that may happen between the 
knibs, and in the middle thereof is a protrac¬ 
ting pin. 
18 Elliptical compares, for defcribing ellipfis of 
various excentricities. 
19 Bows, for drawing curved lines. 
20 Port craiyons. 
Sometimes thefe are all 
made in one inftrument. 
t'j n \ lUflUu lu V/iJL 
23 Protractors. ) 
24 Plain and parallel rules, of feveral fizes. 
25 Ivory pallates for Indian ink and colours. 
26 Gunners callippers. 
27 The regular folids, or platonick bodies cut in 
wood. 
28 Cylinder bifedted. 
29 Cones with all their proper fedlions. 
30 Flat plates, for defcribing the conic fedlions 
upon paper, defigned for thofe who are 
ftudying that branch of fcience. 
In thefe magazine cafes, gentlemen may 
have what number of inftruments they think 
proper. 
Rules of all forts, for meafuring of timber, 
Hone, painting, brick-work, at the ufu- 
3! prices. 
