| abstract |
Propellable apparatus for use in sampling for the contact transfer of a chemical residue on a surface comprising a frame having shoulders with movable supports at one end thereof and having mounted on the other end a roller having thereon a cylindrical layer of a resilient material with chemical residue contact transfer absorption properties similar to human skin, the roller being pivotably mounted such that a desired constant pressure, based on the weight of the roller, is maintained regardless of pressure applied to the shoulder to propel the apparatus. |