Keywords: Huge drop hammers work day and night forming sheet metal parts for United Nations bombers and fighters at the North American Aviation plant, Inglewood, Calif.jpg North American Aviation Inc plant Inglewood Calif The heavy hemp rope is used to snub the hammer so that it forms the part under proper pressure and rises clear of the work after each operation LOC-image fsac 1a35315 Creator Alfred T Palmer 1942-10 PD-USGov Men at work in California Photographs by Alfred T Palmer at North American Aviation Inc plant in Inglewood Calif 1942 Oct Presses Sheet metal Hemp ropes Photographs by Alfred T Palmer California |