I have now published the Sonnet Calligraphic 015 font in the Sonnet Calligraphic thread in the Gallery section of this forum.
The font includes seven attempts at a th ligature.
There is the experiment with a loop joining displayed in the previous post in this thread.
U+E5D7 Alt 58839 th ligature with loop
There are also six experimental ligatures using a cusp joining.
U+E5D9 Alt 58841 th ligature with cusp
U+E5DA Alt 58842 th ligature with crossover and cusp
U+E5DD Alt 58845 th ligature with cusp and spiral
U+E5DE Alt 58846 th ligature with crossover and cusp and spiral
U+E5DF Alt 58847 th ligature with cusp and raised spiral
U+E5E0 Alt 58848 th ligature with crossover and cusp and raised spiral
The raised spiral versions are so as to avoid a clash with a following letter with an ascender, such as the second h in the word thoughtful.
The original spiral was a copy of the spiral used in the h used in the word calligraphy in the following illustration.
th_ligature_002.png
William Overington
22 March 2010