A ball collision demonstration device includes a base, and first and second support assemblies carried by the base. The substrate is a mixture of a chemiluminescent compound, an oxidant, a stabilizer and a buffer. A weighted loss in data capacity is calculated when each of the candidate filters are used, and the filter which gives the lowest loss in data capacity, subject to certain criteria, is used. A pressure bias modulator integrator responsive to brake pressure signals adjusts the wheel velocity error signals to provide an anti-skid control signal. The workpiece guide may also be provided with an infeed extension that rides on the rail system and is capable of supporting workpieces during the operation of the saw. It becomes possible to prepare an integrated circuit by once fabricating linear devices and selecting only non-defective ones therefrom, thereby enabling an improved production yield of integrated circuits.