| Year | 1919 |
| Date | 23-Jan |
| Volume | 40 |
| Issue | 926 |
| Page | 57 |
| Category | General |
| Part | |
| Title | War Developments in Industry |
| Author | Kellaway |
| Notes | Improvements in engineering methods, scientific knowledge in the shops, weight of aircraft engines, magnetos, ignition plugs, scientific and optical glass, dial sights, domestic glass |