Patent ID: 7204028

Claim:
A drafting device for drawing perspective lines from a lower base line horizon, said drafting device comprising: a drawing board providing the drawing surface; and a pair or articulated arm assemblies, each of said arm assemblies including an upper pivot arm including means for pivotal connection at a laterally opposed side of said drawing board, a base arm having a linear upper surface, and first and second connecting arms, one of said connecting arms connected at an upper end to an outer end of said pivot arm and a lower end connected at an out end of said base arm, the other of said connecting arms connected at an upper end to an inner end of said pivot arm and a lower end connected at a middle portion of said base arm, the arrangement being such that said arms can be relative adjusted to position said linear upper surface of said base arm at a horizontal base line on the drawing surface at a base line position, and means for fixing said pivot arm to said drawing board at said base line position, whereby movement of said base arm from said base line position may be used to create perspective lines referenced by said linear surface and substantially intersecting at a vanishing point remote from the drawing surface.