| Year | 1919 |
| Date | 06-Nov |
| Volume | 41 |
| Issue | 967 |
| Page | 421 |
| Category | Electrical |
| Part | |
| Title | Charging Electric Vehicle Accumulators |
| Author | Calculus |
| Notes | Charge & discharge curves for an Edison cell, connections for the motor generator, connections for a mercury vapour rectifier for charging electric vehicle batteries from alternating C. mains, a charging plug & receptacle |