| Year | 1919 |
| Date | 25-Dec |
| Volume | 41 |
| Issue | 974 |
| Page | 581 |
| Category | General |
| Part | |
| Title | Some two-to-one Mechanisms |
| Author | F.Hall Bramley |
| Notes | Side & end elevations of form of two-to-one motion for operating valve & other gears, a cam path two-to-one gear, for operating a contact maker |