| Year | 2005 |
| Date | 21-Jan |
| Volume | 194 |
| Issue | 4,239 |
| Page | 91 |
| Category | Electrical |
| Part | 3 |
| Title | Electro-Pneumatic Contactors |
| Author | Colin Beckwith |
| Notes | Discusses the current path and solenoid windings. Interchangeable parts, brass fabrications, castings in disguise, castings replacing fabrications, solenoid valves, materials, coil design, coil winding |