ไทย ๑ [ไท]
The phonetic entry [ไท] is not fully clear for the following reasons:
Lak Phasa Thai by Kamchai Thonglo

suggests the following:
ใอ = อะ+ย
ไอ = อะ+ย
Accordingly,ไอ = อะ+ย, or ไทย ๑ [ไท =ทัย].
It is discussed whether the final yo yak, as well as the final wo waen, should be i or j and w or o respectively in IPA.
The following picture suggests - in principle - that ไทย ๑ [ไท =ทัย] is /thaj/ in IPA:

But,
"a) where are the rules how to apply IPA on sattha akson?"Any suggestions?



