It defines and groups a project's discrete work elements in a way that helps organize and define the total work scope of the project. Worker - a person engaged in the accomplishment of work. In cost estimating, the hands-on workers contribute to the production and are counted in calculations of the production rate.
Crossbowman cocking an arbalest. The arbalest (also arblast) was a late variation of the crossbow coming into use in Europe during the 12th century. A large weapon, the arbalest had a steel prod (bow). Since the arbalest was much larger than earlier crossbows, and because of the greater tensile strength of steel, it had a greater force. The strongest windlass-pulled arbalests could have up to 22 kN (5000 lbf) of force and be accurate up to 100 m.
RustBlast is a powerful rust remover, zinc phosphate pre-primer, and metal etch. RustBlast effectively dissolves rust, corrosion, metal oxides, and tarnishing from most metal surfaces.