I'm working on some old Watchtowers at the moment and saw this from Russell's era:
Don't worry about reading all the scanned material. I haven't hightlighted these but skim through for the world "WORLD HAS ENDED" (it doesn't feature in the first scan)
Jan 1st 1906
In 1927 (as far as I can work out), this changed to :
Feb 1st 1927
So it is revealed that the world has ended (under Rutherford's control).
However, in Nov 15th 1942 it has changed to this (note that the "TO US" has been removed from "The Sctriptures Clearly Teach" :
However, the fact still remains that the world has ended.
In Dec 1st 1943, it changed to the following :
So now the OLD world ended in 1914 !
This carries on until the last edition of 1949... then as we enter the realm of the Watchtower Library on CD, it ceases (unless I am not searching properly).
Maybe this is why the pre-1950 Watchtowers are not on the CD ???