Iron which is brought near a spiral of copper wire, traversed by an electrical current, becomes magnetic, and then attracts other pieces of iron, or a suitably placed steel magnet. — Hermann von Helmholtz Copy Share Image
Heat can also be produced by the impact of imperfectly elastic bodies as well as by friction. This is the case, for instance, when we produce fire by striking flint against steel, or when an iron bar is worked for… — Hermann von Helmholtz Copy Share Image
During the first half of the present century we had an Alexander von Humboldt, who was able to scan the scientific knowledge of his… — Hermann von Helmholtz Copy Share Image
“I have been able to solve a few problems of mathematical physics on which the greatest mathematicians since Euler have struggled in vain ... But the pride I might have held in my conclusions was perceptibly lessened by the fact that I knew that the solution of these problems had almost always come to me as the gradual generalization of… — Hermann von Helmholtz Copy Share
The originator of a new concept...finds, as a rule, that it is much more difficult to find out why other people do not understand… — Hermann von Helmholtz Copy Share Image
There is a kind, I might almost say, of artistic satisfaction, when we are able to survey the enormous wealth of Nature as a… — Hermann von Helmholtz Copy Share Image
The law in question asserts, that the quantity of force which can be brought into action in the whole of Nature is unchangeable, and… — Hermann von Helmholtz Copy Share Image
What we see is the solution to a computational problem, our brains compute the most likely causes from the photon absorptions within our eyes. — Hermann von Helmholtz Copy Share Image
A raised weight can produce work, but in doing so it must necessarily sink from its height, and, when it has fallen as deep… — Hermann von Helmholtz Copy Share Image
I think the facts leave no doubt that the very mightiest among the chemical forces are of electric origin. The atoms cling to their… — Hermann von Helmholtz Copy Share Image
A moving body whose motion was not retarded by any resisting force would continue to move to all eternity. — Hermann von Helmholtz Copy Share Image
But heat can also be produced by the friction of liquids, in which there could be no question of changes in structure, or of… — Hermann von Helmholtz Copy Share Image
Windmills, which are used in the great plains of Holland and North Germany to supply the want of falling water, afford another instance of… — Hermann von Helmholtz Copy Share Image
