Posted: 19/01/2014 at 11:30
Can help there, Lily.
The 'canister type thing' you describe would be a developing tank. The film was removed from the camera in darkness (or maybe a small red light)..then wound around a plastic spool which was placed inside the tank. The top was the replaced & the liquid developer was then added through a hole in the top....a plastic stick was then put in the hole....this was used to rotate the spool containing the film & thus agitated the developer.
After this process the film (now negatives) was removed from the tank and washed, this was followed by placing in a tray of *'fixing' solution, the washed again before being hung-up with a peg on a line.
Next the negatives were cut-up individually prior to printing and/or enlarging.
*After fixing daylight could be allowed.