[Heb-NACO] rule for adding ' to separate diphthongs?

[Shinohara, Jasmin]

I’m trying to find the reason/rule for adding an apostrophe between adjacent consonants that could be mistaken for different letters/sounds (e.g. a צ with a sheva nah next to an aspirated ה is romanized ts’h, lest someone think it’s a ת followed by a ש).  Can someone please help me find the “chapter and verse”?

Thanks, Jasmin

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Jasmin Shinohara
Hebraica Cataloging Librarian
University of Pennsylvania
Van Pelt-Dietrich Library Center
3420 Walnut Street
Philadelphia, PA 19104-6206
T. 215-746-6397
F. 215-573-9610
jshino at upenn.edu

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