Odd...I guess it just won't allow linking. You can also go to:
www.geocities.com/Pentagon/1592
and then click on the "torpedoes" button. That one does not appear to 404.

Once you're at torpedoes, you see five pdf-format parts that you must click on it turn to get the whole thing.

By the way, I think I indicated that the Mk 13 replacement (Mk 25) was fielded in small numbers near the end of WWII. I now see that is incorrect; it was only a prototype/test weapon and the Mk 13 was the last straight-running/non-homing air-dropped torpedo.