| Year | 1930 |
| Date | 15-May |
| Volume | 62 |
| Issue | 1,514 |
| Page | 467 |
| Category | Electrical |
| Part | |
| Title | Modern Electrical Installation Work |
| Author | Frederick H.Taylor |
| Notes | Switch cover earthing, "shock-proof", Pressel, iron-clad and water-tight, push-button momentary-action type & non-automatic, I.E.E. switch regulations, earthed or isolated switches, circuit & main switches, house main, I.C. switches not "linked tumblers" |