| Ernst Abbe |
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| CATEGORIES ABOUT ERNST KARL ABBE | |
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| 1840 births | |
| abbe, ernst | |
| 1905 deaths | |
| people with craters of the moon named after them | |
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Ernst Karl Abbe ( January 23 , 1840 in Eisenach – January 14 , 1905 in Jena ), was a German Physicist . He was a Professor At The University Of Jena . Abbe is best known for his work in Optics including designing the first Refractometer . However, during his association with Carl Zeiss ' Microscope works, in Jena , he introduced the Eight-hour Workday , in remembrance of the 14-hour workday of his own father. The eight-hour workday would not be widely emulated in the United States until its use in the next century by the Ford Motor Company 1914 , although it was proclaimed in 1884 . See also: EXTERNAL LINKS |
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