... procedure is the work of Norman R. Sparks, Professor and Head, Depart-ment of Mechanical Engineering, The Pennsylvania State University, and CharlesC. DiLio, Associate Professor of Mechanical Engineering, ... procedure is the work of Norman R. Sparks, Professor and Head, Depart-ment of Mechanical Engineering, The Pennsylvania State University, and CharlesC. DiLio, Associate Professor of Mechanical Engineering, ... machines are popular in a variety of applications. For example, in the making of ice for skating, hockey, and curlingrinks, compound reciprocating compressors are often chosen. The refrigeration...