| Year | 1939 |
| Date | 08-Jun |
| Volume | 80 |
| Issue | 1,987 |
| Page | 671 |
| Category | Cinematic |
| Part | |
| Title | Home Talkies |
| Author | L.C.Butler |
| Notes | The construction of a 16-mm. sound-on-film talking picture projector. the two stage main amplifier, the machine threaded, main taper bearings, movietone shaft, the optical system, the sound head, the amplifier, motor and other accessories, workshop |