This collectible item comprises a set of five 12 inch architect Scaling Rules and six 2 inch offsets used to transform the true measurement of an object size by creating an accurate model or drawing that is proportionally reduced or enlarged in size. This is rare and important archtect set of rulers with, fully Engine-Divided double reading, all made of black vulcanite and signed "STANLEY, GREAT TURNSTILE HOLBORN LONDON, 1896". The set comes in its original dovetail mahogany case.