| Year | 1927 |
| Date | 28-Jul |
| Volume | 57 |
| Issue | 1,368 |
| Page | 75 |
| Category | Electrical Work |
| Part | |
| Title | Hints on the Construction and Use of Multiple Scale Combined Measuring Instruments |
| Author | Geo. Gentry |
| Notes | Double reading voltammeter with separate shunt box, milliampere meter and double reading voltmeter, how to use multiple voltmeter, raising the reading, connecting and using the shunt box for current measurement, combined volt and ammeter, double scale |