One of the six 14-ft. diameter wheels (or sheaves) that pull the cable haulage for San Francisco’s three cable car lines spin non-stop at the cable car powerhouse and museum in the historic Nob Hill neighborhood.
Detail of a Pratt & Whitney R-4360 Wasp Major aircraft engine, on display at Addison, Texas’ now-defunct Cavanaugh Flight Museum.
Detail of an antique Smith-Corona Model 250 electric typewriter, found in a Nacogdoches, Texas antique shop.
The first arch of Dallas’ Margaret McDermott Bridge rises over the structure’s construction site on the banks of the Trinity River.