frame is used in making exposures. The artistic possibilities of Velox make it worthy of the study of all photographers and a convenient apparatus for measuring the distance from the light and for adjusting each negative to the proper angle of exposure is of great assistance. As an aid we recommend…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
![An illustration from The space-threshold of colours and its dependence upon contrast [microform] : first article (1898)](https://img.insideoutlibrary.com/img/200/ia-alberta_01297-31-0.webp)
