| Year | 1956 |
| Date | 07-Jun |
| Volume | 114 |
| Issue | 2,872 |
| Page | 949 |
| Category | Electrical |
| Part | |
| Title | Electrical Design Simplified. Magnetic effects |
| Author | J.Gordon Hall |
| Notes | Basic electromagnetic law. Approximate pulls across various air gaps, wire resistances and gauges, "space factor", amp-turns required for air gaps, practical design of electromagnets |