SummaryView of seven men standing on catwalk during construction of the Brooklyn Bridge. Sign in foreground, "Safe for only 25 men at one time. Do not walk close together, nor run , jump, ot trot. Break step!" Signed, "W. A. Roebling, Eng'r in Chief." It is impossible to determine whether the photograph was taken from the Brooklyn or the Manhattan side of the bridge. None of the copies are dated.