Hepworth, Thomas Cradock, -1905 · London : Hazell, Watson, and Viney · leaf 171
159 AMATEUR PHOTOGRAPHERS. which are tapped and protected through the lid of the box. Collars here engage the screw thread upon … Fig 56. each, and by simply turning these screws between the thumbs and fingers of the two hands at the same
Slides (Photography) · Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer03inte-214-125.webp)
