biography
| name: |
Rowland, Henry Augustus
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| sex:
| male
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| lived:
| (1848–1901)
|
| biography:
| Physicist, born in Honesdale, Pennsylvania, USA. The first professor of physics at Johns Hopkins University (1875–1901), he invented the concave diffraction grating used in spectroscopy, discovered the magnetic effect of a moving electric charge, and improved on the values of the ohm and the mechanical equivalent of heat. |
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