David Schwarz, a Zagreb Jew (1852-1897),
invented the airship that is today unjustly bearing the name of
the German count Zeppelin. Indeed, Zeppelin bought the complete
project from Schwartz's wife, shortly after his premature death.
It is true that the `Zeppelin' constructed by Schwartz fell down
due to a small technical error in the propeller. He was not able
to finance a new experiment. While preparing the project of his
flying ship, which for the first time was predicted to be metal
made, he had to resolve many technical and technological problems.
This led to the discovery of the special aluminium alloy now known
under the name dural, also called the Schwartz aluminium.