These are Zeiss instruction leaflets for 3 of their 4 DIC designs for 160mm tube microscopes.
+ extract from the Zeiss Universal Manual on the use of the 4th DIC model, as I have not located an instruction leaflet as yet.
Note: 2 are for reflected DIC and the other 2 are for transmitted DIC
The 4th model was the latest of the 160 designs.
#1: https://goo.gl/3RGJia
#2: https://goo.gl/YF1mRR
#3: https://goo.gl/H0iBCk
#4: https://goo.gl/olIv5c
Update 31/03/2020: Have located the leaflet for the 4th DIC design
# IV: https://www.dropbox.com/s/p6bki2x8iz1z5 ... V.pdf?dl=0
Zeiss DIC leaflets/brochures
Zeiss DIC leaflets/brochures
Zeiss Standard WL (somewhat fashion challenged) & Wild M8
Olympus E-P2 (Micro Four Thirds Camera)
Olympus E-P2 (Micro Four Thirds Camera)