Schematic of Boulton - Watt steam engine, ca. 1780

"When you measure what you are speaking about and express it in numbers, you know something about it; but when you cannot express it in numbers, your knowledge about it is of a meagre and unsatisfactory kind." William Thomson (Lord Kelvin), 1824-1907.

"Die Energie der Welt ist konstant. Die Entropie der Welt strebt einem Maximum zu." Rudolf Julius Emmanuel Clausius, 1822-1888.