An object of the present invention is to reduce the burden of purchasing measurement devices for clinical tests, and to simplify user support for the measurement devices. The length of a mail piece is measured and a desired gap time between the mail piece and a subsequent mail piece is calculated. The ball is spring mounted in the receptacle and the receptacle contains and surrounds a bushing with elastic material located between the receptacle and bushing. Each of the codewords includes at least a length of a subsequent non-matchable sequence preceding a matchable first sequence. As the circular disk segments rotate, their outer circumferences rest against the bottom surface and rotate the object. A first steam of hot natural gas-based synthesis gas having a first higher molar ratio of H2:CO is combined with a second stream of quenched synthesis gas having a second lower molar ratio of H2:CO to provide a blend of synthesis gas having a third molar ratio of H2:CO that is between the first and second molar ratios.