There is a fee now, costs are so high in buying, scanning, running the site the museum could not afford it - some of the rarer manuals cost well over £100 each and we can't really fund that from the museum.
However, if you read the rather lengthy blurb it does say that if you are only looking for one or two manulas, email and we'll mail them straight back. The fee is aimed more at those who want to download loads of stuff.
Cheers
Paul
Internal Fire Museum of Power