| Year | 1938 |
| Date | 24-Feb |
| Volume | 78 |
| Issue | 1,920 |
| Page | 179 |
| Category | Electrical |
| Part | |
| Title | Reducing the Noise from Electromotors |
| Author | A.H.Avery |
| Notes | Ancient and modern designs, initial choice of motor, the causes of noise, checking spigots on end frames, systematic diagnosis, checking concentricity of spigots, magnetic faults, balance essential, fan noises, air-gap corrections |