| Year | 1949 |
| Date | 06-Oct |
| Volume | 101 |
| Issue | 2,524 |
| Page | 437 |
| Category | Electrical |
| Part | |
| Title | Voltmeters, Ammeters and Ohmmeters |
| Author | A.R.Turpin |
| Notes | Various types of government surplus instruments, basic circuit diagrams, shunts, resistances, instrument rectifiers, current transformer, wafer switch |