continuous fractional scrolling

[B . T . Raven]

I am starting to like reading long pdfs in Adobe Reader with
View>Pagedisplay>Automatically scroll and I was wondering if something like this
is possible with Emacs for reading plain-text files (rendered in a
proproportional font). In the *scratch* buffer (window)I copy-pasted a long
stretch of text and put the following at the end:

(set-window-vscroll (selected-window) 1 t)
(scroll-up-line)
(scroll-up)
(scroll-up-line)
(scroll-other-window) 
etc.

and then evaluated each form with C-x C-e and expected repeated evaluations of
(scroll-up-line) et al. to move buffer text pixel-wise but that didn't happen.

Is there a way in Emacs to make a text buffer continually scroll without user
interaction?

Thanks,

Ed