This article describes a schematic synthesis problem and one of its solution techniques. The problem domain consists of devices that can be described as networks of lumped-parameter, idealized elements in the translational-mechanical, rotational-mechanical, fluidmechanical, and electrical media. Such devices include speedometers, accelerometers, pneumatic cylinders, and pressure gauges. Design problems in this domain are specified by an input quantity, an output quantity, and the desired relationship between the input and output. The solution technique is based on three steps: 1) generate a candidate design, 2) derive and classify the behavior of the candidate, 3) based on the derived behavior and domain knowledge, modify the candidate (if possible) to bring it in line with the specification. The key idea behind this techniques is that an abstract characterization of the essential properties of the candidate design expedites the analysis and modification. The results of this work are aimed at computer tools for preliminary mechanical design.