Parts list: 1. Item A: 24-hour clock, adjustable times, maximum number of "on" periods, once per hour, single-pole- single-throw (SPST) switch, normally open, Dayton, No. 2E025. 2. Item B: Single-pole-double- throw (SPDT) relay, coil 11 0 volts alternating current (vac), Potter- Brumfield Series AB. 3. Item C: Double-pole-double- throw (DPDT) relay, coil 110 vac, Potter- Brumfield Series A