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The National Museum of American History's new permanent exihibition, "On Time," showcases an array of timepieces, including, top: a stopwatch (c.1859) and a windup alarm clock (c.1930); center: a 19th-century Swiss watch resembling a mandolin, an American wooden-gear clock (c.1815) and a Connecticut box clock (c.1816); bottom; a local sun-time clock from Philadelphia (c.1874) and a clock with an acorn-shaped face (c.1849)