Oil Filter Diagram

An automotive aftermarket manufacturer required a diagram illustration to show how a new type of cellulose fiber could filter automotive oil better than previous competitive products. This is a sepia line art drawing on D’Arches watercolor paper, with Windsor...

Mercedes Benz Protoype C-111 Gullwing

Randal did this drawing of a Mercedez Benz Prototype Model C-111 in the 1980’s. Based upon a photo of this experimental, Wankel-powered automobile, the illustration was done by hand with ink lines and black wax pencil shading on croquill board. Croquill board...