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  • 1. THE ORTHOGRAPHIC SYSTEM
  • 2. (1746 –1818) WASGASPAR MONGE A FRENCH MATHEMATICIAN, A REVOLUTIONARY, AND THE INVENTOR OF DESCRIPTIVE GEOMETRY, THE THEORETICAL BASIS ON WHICH TECHNICAL DRAWING IS BASED. DURING THE FRENCH REVOLUTION HE SERVED AS A MINISTER OF THE MARINE AND WAS INVOLVED IN THE REFORMATION OF THE FRENCH EDUCATIONAL SYSTEM, FOUNDING THE ÉCOLE POLYTECHNIQUE.
  • 3. FIRST SECOND QUADRANT QUADRANT VERTICAL PLANE HORIZONTAL PLANE GROUND LINE FOURTH THIRD QUADRANTQUADRANT
  • 4. REPRESENTATION OF AN OBJECT VERTICAL PROJECTION OBSERVER HORIZONTAL PROJECTION
  • 5. A´A
  • 6. a´# a´ Aa´ a a
  • 7. a´# LEVEL a´ DISTANCE A OR LEVEL HEIGHT LEVEL OR OR HEIGHT HEIGHT DISTANCEa´ a DISTANCE a
  • 8. nts and straight linesstem.yed in Technicalchnical Drawinged about thee instruments.ey are drawing.s:e the task. instruments.graphic system.e accurate, neat uation criteria.)
  • 9. A’ A A’A’ A A
  • 10. B’ BB’ B’ B B
  • 11. C’ C C’C’ C C
  • 12. D’ D D’D’ D D
  • 13. E’ E E E’ E E
  • 14. F’ F F’ F
  • 15. A’ D’ C’ B’ D E’ F’ FA C E B
  • 16. R’ R V’ R’ V R RH’ H
  • 17. V’ R’ H’ V R V’ H R’ V R RH’ H
  • 18. R’ R R R’V’ RV
  • 19. V’ R’ V R R R’V’ RV
  • 20. R’ R R R’ RH’ H
  • 21. R’ H’ R H R R’ RH’ H
  • 22. 5.2 Drawing different types of straight line Object • To dra quadra • To use Materi • Graphi • 45º and • Ruler a Presen • This ac • The ta Studen • The stu proced handlin Evalua Assess usi 1. Correc 2. Proper 3. Accura 4. Turned (See Te