| Year | 1949 |
| Date | 20-Oct |
| Volume | 101 |
| Issue | 2,526 |
| Page | 502 |
| Category | Workshop |
| Part | |
| Title | Cotton Bobbins in the Workshop |
| Author | "Technician" |
| Notes | A variable resistance, part section of connector showing method of construction, cotton bobbin holder for dental burrs |