| Year | 1919 |
| Date | 23-Jan |
| Volume | 40 |
| Issue | 926 |
| Page | 52 |
| Category | Electrical |
| Part | |
| Title | Carbon Brushes: Considered in Relation to the Design and Operation of Electrical Machines |
| Author | P.Hunter-Brown |
| Notes | Paper read before the Institute of Electrical Engineers. Design of brush, selection of grade |