OCR Text |
Show Uaeful Drawing Apparatus. An apparatus which makes it possible possi-ble to draw In perspective mechanically, mechani-cally, without previous training. Is the Invention nt u Swiss, who names It the pcrspectartlgraph. A telescope with hair Hues to show Us cenU and a crayon pencil are hung with a universal uni-versal Joint 0 that thoy move together. to-gether. The draftsman holds the pencil pen-cil In his hand and moves It over tho paper in such a way as to make tho Intersection In-tersection of tho hair lines In tho telescope tele-scope follow tho outllno of tho object to be copied. |