Direct access is acceptable when the scaffold is not more than 14 inches (36 centimeters) horizontally and not more than 24 inches (61centimeters) vertically from the other surfaces. 1926.451(e)(8) The standard prohibits the use of crossbraces as a means of access.
H Bomb. Abbreviation for Hydrogen Bomb. The hydrogen bomb is the big brother of the first nuclear bombs, Fat Man and Little Boy, which were dropped on Nagasaki and Heroshima in 1945. The hydrogen bomb uses a hydrogen neutron, fired at high speed, into an atom of some unstable element, usually uranium.
Thus, the A-for atomic bomb, and the H, for hydrogen bomb are both nuclear weapons. In the history of the modern world as we know it, the atomic bomb was only used once to kill human beings: it was dropped on the Japanese people in Hiroshima and Nagasaki in 1945.