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 some time by powerful blows of the hammer.
Hermann von HelmholtzAbout author
- Author's profession: Physicist
- Nationality: deutsch
- Born: August 31, 1821
- Died: September 8, 1894
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It is never too late to revive your origins. It is their destiny: since they were not the first to be in on history, they will be the first to immortalize everything by reconstitution (by putting things in museums, they can match in an instant the fossilization process nature took millions of years to complete). But the conceptions Americans have of the museum is much wider than our own. To them, everything is worthy of protection, embalming, restoration. Everything can have a second birth,...
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