B63-710. DRAFTING INSTRUMENT. Harrison's Patent Clinograph. 12" square with a folding leg, used by draftsman with a T-square to lay out different angles. Manufactured by W.H. Harling, who worked in London in the late 1800s. Rosewood with ebony edging and brass hinge. Marked "Harrison's Patent" and with Harling's trademark. From the collection of Dennis Fisher. Fine 100-200