D. P. HENRY
DRAWING PRODUCED BY THE HENRY DRAWING MACHINE, 1960s
“Basically, the apparatus is a modified mechanical analogue computer, originally operated by two electric servo-motors and air-pressure. Drawings are produced by combinations of pen-movement and table-movement. The pen is moved in elliptical paths of various dimensions, and the harmonic table-movements distort the ellipses at selected points, at the same time shifting the paper in a curved path.
The method of paper-shifting and ellipse distortion is such as to introduce varied degrees of randomness into the designs, thereby ensuring that no two are exactly alike.”