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.
Smart Bomb Image Gallery. A dumb bomb is a bomb with only these elements, dropped from an airplane (such as the B-2 bomber). The bomb is considered dumb because it simply falls to the ground without actively steering itself. Needless to say, it's some feat hitting a target precisely with this type of weapon.