| Year | 1922 |
| Date | 13-Jul |
| Volume | 47 |
| Issue | 1,107 |
| Page | 42 |
| Category | Radio Engineering |
| Part | 14 |
| Title | Wireless Notes - "H.T." Supply |
| Author | A.V.Ballhatchet |
| Notes | Zinc plates for H.T. battery cells, 48-cell battery, connections to rotary series-parallel switch for aerial condenser |