“Well, take it. Pronounce my name, noting exactly the second when you speak. I will repeat it as soon as it shall come to me, and you will observe the exact moment when you get my answer.”

“Yes; and half the time between my call and your answer will exactly indicate that which my voice will take in coming to you.”

…

“Just so, my uncle.”

…

“Are you ready?”

…

“Yes.”

…⁠ ⁠…

“Now, attention. I am going to call your name.”