The Modmin has been a go-to for quality videos and tutorials on architectural drawing and sketching. Their newest video tackles a drawing fundamental: the ability to draw a straight line. For many ...

VI I NOW come to the second of the parallel motions I said I would show you. If I take a kite and pivot the blunt end to the fixed base and make the sharp end move up and down in a straight line, ...

III. BEFORE leaving the Peaucellier cell and its modifications, I must point out another important property they possess besides that of furnishing us with exact rectilinear motion. We have seen that ...