| Year | 1944 |
| Date | 20-Jul |
| Volume | 91 |
| Issue | 2,254 |
| Page | 50 |
| Category | Optical |
| Part | |
| Title | An Optical Projector |
| Author | John Hellewell |
| Notes | For the accurate measurement of profiles. General view - front side, three elevations and plan, view from rear showing table elevating screw, close-up showing gear cutter in position for checking profiles, showing master reference plug in position, finish |