Bromide enlarging and contact printing : how to do it (1892)
Dresser, A. R · London : Fry Manufacturing Co. · leaf 35
ill give good enough definition. 'Fo use an unnecessarily small stop is a disadvantage ; it prolongs exposure and tends to make the resulting pictures poor and flat in quality. At G is a special cap to fit the lens quite easily. It has a piece of yellow glass substituted for the opaque leather… … Special Cap, fitted with yellow glass, work by measurement or guess work, and this is not well. It will be seen from this description, that there is not anything very special about an enlarging camera that can- not be easily “ rigged up ” with an ordinary instrument. Obviously it is an advantage to…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.