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.

Quote by Hermann Von Helmholtz

Topics: Hermann Von Helmholtz Quotes

Not that I wish by any means to deny, that the mental life of individuals...

Not that I wish by any means to deny, that the mental life of individuals...

What appeared to the earlier physicists to be the constant quantity of heat is nothing...

What appeared to the earlier physicists to be the constant quantity of heat is nothing...

I then endeavoured to show that it is more especially in the thorough conformity with...

I then endeavoured to show that it is more especially in the thorough conformity with...

Heat can also be produced by the impact of imperfectly elastic bodies as well as...

Heat can also be produced by the impact of imperfectly elastic bodies as well as...

A raised weight can produce work, but in doing so it must necessarily sink from...

A raised weight can produce work, but in doing so it must necessarily sink from...

But heat can also be produced by the friction of liquids, in which there could...

But heat can also be produced by the friction of liquids, in which there could...

Now, the external work of man is of the most varied kind as regards the...

Now, the external work of man is of the most varied kind as regards the...

A moving body whose motion was not retarded by any resisting force would continue to...

A moving body whose motion was not retarded by any resisting force would continue to...

The law in question asserts, that the quantity of force which can be brought into...

The law in question asserts, that the quantity of force which can be brought into...

You all know how powerful and varied are the effects of which steam engines are...

You all know how powerful and varied are the effects of which steam engines are...

Windmills, which are used in the great plains of Holland and North Germany to supply...

Windmills, which are used in the great plains of Holland and North Germany to supply...

The older view of the nature of heat was that it is a substance, very...

The older view of the nature of heat was that it is a substance, very...

Reason we call that faculty innate in us of discovering laws and applying them with...

Reason we call that faculty innate in us of discovering laws and applying them with...

Each individual fact, taken by itself, can indeed arouse our curiosity or our astonishment, or...

Each individual fact, taken by itself, can indeed arouse our curiosity or our astonishment, or...