Direct URLs (after logging in on a different machine) seem to be

http://library.efdss.org/archives/images/collinson/COL-01-718.gif
http://library.efdss.org/archives/images/collinson/COL-01-719.gif
http://library.efdss.org/archives/images/collinson/COL-01-720.gif

I'll take a look at those in a bit.

The web designer who fucked up the EFDSS site like that appears to be one Richard Butterworth. Thanks a bundle, whoever you are.