Importance: Direct and Secondary
The spinning wheel increased the productivity of thread making by a factor of greater than 10. Medieval historian Lynn White credited the spinning wheel with increasing the supply of rags, which led to cheap paper, which was a factor in the development of printing.
Read more about this topic: Spinning Wheel
Famous quotes containing the words direct and/or secondary:
“Science is a system of statements based on direct experience, and controlled by experimental verification. Verification in science is not, however, of single statements but of the entire system or a sub-system of such statements.”
—Rudolf Carnap (1891–1970)
“Cloud-clown, blue painter, sun as horn,
Hill-scholar, man that never is,
The bad-bespoken lacker,
Ancestor of Narcissus, prince
Of the secondary men. There are no rocks
And stones, only this imager.”
—Wallace Stevens (1879–1955)