Construction of Lock Walls, showing Three Flights of Locks

Front:
Construction of Lock Walls, showing Three Flights of Locks, Gatun, Panama Canal,

Back:
CONSTRUCTION OF LOCK WALLS. SHOWING THREE FLIGHTS OF LOCKS, GATUN, PANAMA CANAL. More than 2,000,000 cubic yards of concrete has been required for the construction of Locks at Gatun. There are six in number, three sets of twin locks, each step representing a lift of 28% feet, a total lift of 85 feet, the length of each lock is 1,000 feet, and width 110 feet. PHOTOCHROM A-40382