Two men crouch next to a flowing channel of water in an indoor facility at the U.S. Engineers hydraulic laboratory at Bonneville, Oregon. A sign in the lower right of the photograph reads, "Oregon Shore." (negative 11 of 16).

Three men crouch next to a flowing channel of water in an indoor facility at the U.S. Engineers hydraulic laboratory at Bonneville, Oregon. A fourth man is visible holding a bucket and adding white strips to the water in the background (negative 8 of 16).