| Year | 1923 |
| Date | 21-Jun |
| Volume | 48 |
| Issue | 1,156 |
| Page | 649 |
| Category | Model Engineering Equipment and Supplies |
| Part | |
| Title | A Review of Current Technical Progress. The Crypto Patent Rectifier: A Machine for Charging Accumulators from A.C. Supply Mains |
| Author | |
| Notes | Crypto rectifier for charging accumulators, the switchboard, connections of rectifier, A.C. supply switchboard and cells |