Prevailing wages are established by regulatory agencies for each trade and occupation employed in the performance of public work, as well as by State Departments of Labor or their equivalents. Prevailing wages were first established shortly after the Civil War when Congress passed the National Eight Hour Day law.upporters suggest that prevailing wage laws seek to prevent public construction projects from destabilizing a local construction industry and to advance other priorities such as workforce development, green building, and greenhouse gas reduction.
In some species, the claspers are held in place by spiny projections. Claspers can also refer to appendages some male insects use to hold females in place during copulation. Male dragonflies, for example, have sharp claspers at the tip of their segmented bodies that fit into the back of the femaleâs head during mating. (Read more about dragonflies' strange sex habits.)
Washers are used for multiple purposes when mechanical parts are assembled. Here are some usages : Some washers have a special design that attempts to help keep the nut and/or bolt from coming loose. Known as a lock washer these may be a split ring type, star type, wavey or any one of a number of other designs. A lock washer will be used with the part of the assembly that most likely could turn such as the nut. It could be used under the bolt head in instances where the bolt screws into threads in one part of the assembly. A washer is sometimes used to protect the surface of the assembled parts.