VMS List post from 1994

[Brian Eric Farnell <bfarnell@xxxxxxx>]

I found the answer and some further historical data on a
question asked recently while I was muddling through the old
Voynich list archives.  The question is below and the answer
from a 1994 post by Jim Reeds follows.
Regards,
Brian

Gabriel Landini wrote:
> 
> On 31 Aug 2000, at 11:31, Anders, Claus wrote:
> >   This Book is written in chinese
> >  gives
> >   Tikv Bpqn it wskwxjt io cikqixk ...
> >  where I simply replace the nth char. in the word with same letter+n
> > in the alphabet (with an one to one char mapping).
> 
> Shouldn't this be:
> Ujlw Cqto ju xtlxyku jp djlrjyl ?
> I mean starting with the position '1'?
> 
> I wonder what the character distribution and the entropy of this
> would be. Each word is always written the same, but the word
> construction is completely different.
> 
> Does this encoding method have a name?
> 
> Cheers,
> Gabriel

Post from 1994:

reeds@xxxxxxxxxxxxxxxx wrote:
> 
> The other day I dropped in to the Bancroft library in Berkeley and looked
> at their Schott and Selenus, which date from roughly the same era as the
> Heidel book.  In one of them (I forget which, but I think it was Selenus)
> there is an explanation of a progressive key cipher, according to which
> this paragraph would be enciphered "Ujh synlz..."
> 
> Jim Reeds