Historic Engineering ExperimentsBlack-and-white photos of testing machinery and historical engineering projects, including structures associated with the Panama Canal. Photo collection Government information service. Delta works, aquacloop laboratory. undated 172 assets in this story4443-218934156145-528947426145-486631366145-527297276145-458446606145-531526416145-523924336145-486285896145-295827476145-506115276145-53134580255-69335751255-202493976177-V538132876145-487099966145-519605696145-519732436145-519719346145-486500596145-467854856145-488834156145-523470526145-589476156145-438045466177-V536196116177-V538437536145-519615066145-486803036145-467693526145-528947396145-486285906145-52894465486-48866145-488317256177-V549926016145-434603956145-486910936145-485678506145-528948696177-V538257406145-589421246145-531490476145-488530114409-500435456145-431265186145-528972296145-295912566145-488480051035-9736145-431535106145-523848546145-487095946145-441988066145-506100186145-523926784129-5346145-292726316145-531470516145-505193054409-500504906145-301396144443-218626946145-486499056145-432047656145-523893854443-217567526145-546046416145-505769606145-436845876145-506016796145-505522786145-43668676 PREVIOUS of 2 NEXT