[ g ] or ch. is sharper than [ h ] which I teach thus, when I shew to my Deaf Patients the posture of the Tongue in a Looking-Glass, and give them to feel the expiring Breath ; it is so in like manner with [ s ] and [ f ] insomuch, as nothing is more easie than they, and which may most easily be learned by the fore-going Description.
— from The Talking Deaf Man A Method Proposed, Whereby He Who is Born Deaf, May Learn to Speak by Johann Conrad Amman
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