[PERPETUAL MOTION] IS IT A PERPETUAL MOTION? Philadelphia: Crascup [?} & West, ca. 1870. Letterpress broadside advertising an exhibition of this unusual contraption and bearing an elaborate wood engraving of a Rube Goldberg-type mechanism purported to run in perpetual motion. According to the caption, “It weighs about 500 lbs., is made of the finest steel and silver, nickel-plated, and is probably one of the finest and most complex pieces of machinery in the world. Comments from the press and public fill the balance of the bill. Framed to 16 × 10¾", sight 10 × 5½". See Exemplars, page 295.