Bromide paper : instructions for contact printing and enlarging (1896)
Just, E. A · Bradford : P. Lund, Humphries · leaf 38
ping of the belt connecfling the motor with the dynamo, delay in the automatic regulation of the carbon points, and many other circumstances will cause considerable irregularity in the light intensity which, although of little importance when enlarging with long exposures, yet will cause… … to any other method of illumination for the following reasons : — I St. On account of its exceedingly high light intensity. 2nd. Because the light emanates from a point, permitting parabolic refledfors to be used, and is also suitable for con- centration by condensers. *The best lamp for this…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
