B63-695. FRAMING CALCULATOR. Woods "Key to the Steel Square." 3" celluloid square with rotating dials on each side, used to calculate different angles using a steel square to lay out hips, rafters, etc. Includes a 40 page book of instructions, in a leatherette pouch, intact with original snap fastener. Copyright in 1902 A. W. Woods of Lincoln, NE, whose name is also stamped in gold lettering on the pouch. From the collection of Ray Schmidt. Fine 50-100