| Year | 1933 |
| Date | 25-May |
| Volume | 68 |
| Issue | 1,672 |
| Page | 491 |
| Category | Electrical |
| Part | |
| Title | Practical Dynamo and Motor Testing. General and Special Faults. Tests on New and Old Machines. A General Survey of Mechanical Faults |
| Author | A.H.Avery |
| Notes | Mechanical faults, bearing friction, brush friction, commutator troubles, recessing micas, eccentric commutators, ball bearing troubles, brush bedding, brush springs |