| Year | 1930 |
| Date | 08-May |
| Volume | 62 |
| Issue | 1,513 |
| Page | 441 |
| Category | Electrical |
| Part | |
| Title | Modern Electrical Installation Work |
| Author | Frederick H.Taylor |
| Notes | Wiring E.S. or G.E.S. holders, lamp-holders & I.E.E. regulations, galleries for lamp-holders, lamp-holder adaptors, switches, tumbler switches: surface sunk & semi-sunk, sunk or small base switches, semi-sunk switches, switch-plates, tumbler switch |