| Year | 1911 |
| Date | 30-Mar |
| Volume | 24 |
| Issue | 518 |
| Page | 310 |
| Category | Replies in Brief |
| Part | |
| Title | Wheatstone rotating mirror, abstruse calculations, "Handbook of Wireless Telegraphy" by Erskine Murray, "The Principles of Electric Wave Telegraphy" by J.A.Flemming |
| Author | K.L. |
| Notes |