Alexander Graham Bell conceived of using varying resistance in a wire
conducting electric current to create a varying current amplitude.
Bell wrote in a letter to Gardiner Greene Hubbard:
“a continuous current of electricity passed through a vibrating wire
should meet with varying resistance, and hence a pulsatory action
should be induced in the current” – Alexander Graham Bell
🛠 Think Like a Telephone Engineer
Every breakthrough in telephone history began with an engineer solving a problem. Could you solve it?