INTRODUCTION It is always of interest to note that Alexander Graham Bell was a teacher of the deaf and that during the course of his experiments to construct a device to amplify sounds for his deaf' pupils, he invented the telephone. And, ironically, . . .

INTRODUCTION It is always of interest to note that Alexander Graham Bell was a teacher of the deaf and that during the course of his experiments to construct a device to amplify sounds for his deaf' pupils, he invented the telephone. And, ironically, . . .