| Year | 1915 |
| Date | 08-Apr |
| Volume | 32 |
| Issue | 728 |
| Page | 280 |
| Category | Electrical |
| Part | |
| Title | A 20-Cell Electro-Medical Constant-Current Battery |
| Author | G.Gentry |
| Notes | The Galvanometer. Full-size details of 30 M.A. simple milli-amperemeter, diagram of wiring for bobbins, full-size detail of baseplate & swivel of milli-amperemeter |