| Year | 1924 |
| Date | 14-Aug |
| Volume | 51 |
| Issue | 1,216 |
| Page | 182 |
| Category | The Model Engineer and His Laboratory |
| Part | 9 |
| Title | Photometry |
| Author | A.H.Stuart |
| Notes | Illustrating the inverse square law, umbra and penumbra of a shadow, efficiency, Joule's law, lighting, candle power, the inverse square law, shadows, the Rumford photometer, the Bunsen photometer, light distribution, polar graphs, the foot candle |