202 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



No. 4224. 



No. 4230. 



No. 4238 (in use). 



No. 4244. 



HHHHHH * PARAGON DPAWIN. 



No. 4236. 



No. 4242. 



4224. DRAWING PEN, Bow, steel spring, with steel points and metal handle $2.25 



4226. DRAWING PEN, Ruling, spring blade, metal handle 1.75 



4230. BLACKBOARD DRAWING INSTRUMENTS a set of four pieces, consisting of a 24-inch T square, 



a 36 inch straight edge, a 24-inch triangle graduated in inches, and a 15% inch protractor. 

 Per set 4.50 



4231. T SQUARE only of No. 4230. l.OQ 



4232. STRAIGHT EDGE only of No. 4230 75 



4233. TRIANGLE only of No. 4230 1.50 



4234. PROTRACTOR only of No. 4230 2.10 



4236. BLACKBOARD COMPASS, of wood, 15 inches long, with crayon holder and rubber foot. . .60 

 4238. BLACKBOARD T-SQUARE, Upright T-Square, for use in making mechanical drawings on a 



blackboard. This device fits into the ordinary chalk tray and is provided with two sets of guid- 

 ing rollers which keep the blade parallel to the blackboard and yet free from it. An adjust- 

 able slide is provided for drawing horizontal lines and both vertical and horizontal blades are 

 graduated. The Upright T-Square is used in the same manner as the Draftsman 's T-Square and 

 is of service in any subject requiring drawings, sketches, plots, tabulations or diagrams. 



No 



Length, inches 



For blackboard height, inches 



Each 



4240. DRAWING PAPER, slightly grained surface. 



No 



Size sheet, inches 



Per quire 



4242. DRAWING PENCILS, Faber, polished. 



No 



Each 



4244. RULES, Parallel, ebony. 



Length, inches 



Each 



A 



15x20 

 .80 



B 



19x24 

 1.00 



40 



42 



4.25 



C 



22x30 

 1.40 



4H 

 .12 



9 

 1.25 



B 



46 



48 



4.25 



D 



27x40 

 3.50 



6H 

 .12 



12 

 1.40 



