Mahogany model consisting of an open frame 18" high, enclosing three other telescoping frames of similar length, capable of extending to 73." Each frame is slotted to fit those contained within it. A windlass at the base operates the elevator through simple pulleys. The base has folding projections to increase the effective base area. Unmarked. (Robert P. Multhauf, "Catalogue of Instruments and Models," 1961).