Alexander Melville Bell was a teacher and researcher of physiological phonetics and was the author of numerous works on orthoepy and elocution.
Excerpt from Wikipedia, available under CC BY-SA 4.0.

"Elocutionary Manual." The Principles of Elocution, With Exercises and Notations, for Pronunciation, Intonation, Emphasis, Gesture and Emotional Expression
2022
ISBN 9781016227186
Visible Speech The Science ... of Universal Alphabetics; Or Self-Interpreting Physiological Letters, for the Writing of All Languages in One Alphabet
2018
ISBN 9780342874989
Explanatory Lecture on Visible Speech, the Science of Universal Alphabetics Delivered Before the College of Preceptors, Feb. 9, 1870
2018
ISBN 9780343122027
The Principles of Elocution
2022
ISBN 9781017881233
Visible Speech
1976
ISBN 9780403065912
Principles of Elocution
1887
ISBN 9780781209427