| Year | 1939 |
| Date | 22-Jun |
| Volume | 80 |
| Issue | 1,989 |
| Page | 734 |
| Category | General |
| Part | |
| Title | A Light Elevating Balance |
| Author | Geo. Gentry |
| Notes | Constructional details of a useful piece of apparatus that is simple to make. The drawings, materials required, base piece, column and guide, bending the hook, finger lever |