Thief of Time - Vibrate

Jeremy’s brow wrinkled, as if the brain behind it was trying to fit around an unfamiliar concept.

“Yes,” he said at last. “Did you know, doctor, that copper octirate vibrates exactly two million, four hundred thousand and seventy-eight times a second?”

“As much as that, eh?” said Dr. Hopkins. “My word.”

***

The Thief of Time - p94