
I used to be a compositor and in the type cases, there were separate compartments for dipthongs and ligatures.
Two vowels together were difficult to put together using type, so one piece of type was created called a dipthong.
/sad old fart blog
( , Fri 22 Aug 2008, 11:59, archived)

In typography, a distinction was made between ligatures for contextual forms and ligatures representing dipthongs. This is because, for example, an æ should not be used to replace ae, while one of the fi ligatures may be selected as required. æ is a letter in its own right, while the typographical ligatures are not.
( , Fri 22 Aug 2008, 12:03, archived)

:)
Edit: Oil on water detail is superb!!
( , Fri 22 Aug 2008, 12:09, archived)

Been a little slack at taking photos recently, and even slacker at uploading them.
( , Fri 22 Aug 2008, 12:12, archived)

Its not the only part of you that's been a bit slack.
your bumtubes.
( , Fri 22 Aug 2008, 12:13, archived)