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.
For a bomb, the energy required to fuse the light atoms in the H-bomb is given by an A-bomb surrounding the core. The A-bomb is triggered to explode with a lot of energy directed inwards (a lot still spills outwards), which fuses the light atoms and triggers the H-bomb. microseconds of fun for all.