| Year | 1928 |
| Date | 08-Mar |
| Volume | 58 |
| Issue | 1,400 |
| Page | 222 |
| Category | Electrical |
| Part | 3 |
| Title | Practical Private Telephone Installations at Low Cost |
| Author | B.Clements Henry |
| Notes | Switch Gears. Two-position switches, three-position switches, defects of the single-line switch, double-line switches, home-made switches |