CATALOGUE, & c , 



A CASE OF MATHEMATICAL INSTRUMENTS. 



A Pocket Case of Mathematical Instruments (see Fig. 1, 

 next page) usually contains the following, viz. : 



1 Pair of 5 -inch plain compasses, 



2 Pair of 6 -inch drawing compasses, with one leg or point 



movable, 



3 Pencil point, 



4 Ink point, 



5 One for dotting, 



6 Drawing pen, with a protracting pin in the handle, 



7 Protractor in the form of a semicircle, 



8 Plain scale, 



9 Parallel rule, 



10 Sometimes a sector, 



11 Also sometimes a bow pen, 



12 Pencil. 



Price $3.50 ; $5.00 ; $8.50. 



A Magazine Case of Instruments (see Fig. 2, page 14), 

 of fine quality, contains 



1 Pair of 6-inch drawing compasses, with a movable leg, 



2 Ink point, 



3 Pencil point, 



3 Lengthening piece, 



4 Pair of 5-inch hair compasses, 



5 Drawing pen, with ivory handle, 



6 Bow pen, 



7 Bow pencil, 



8 Knife, file, key, and screw-driver, for the compasses, in 



one piece, 



