Patrick Hamlyn wrote:
"The3rd Earl Of Derby" wrote:

R.H. wrote:
This week's set has just been posted:

http://puzzlephotos.blogspot.com/


Rob

753. Is a photographers homemade darkroom enlarger, the lifting
cover plate is where the negative glass plate is placed.
The bulbs act as the light source.

Which part does the magnification?

Plates didn't need magnification the camera done that. ;-)

The negative plate was placed in the square housing and then the light
switched on for a few seconds and then immersed in the developer.

--
Sir Benjamin Middlethwaite