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| Picture No | 10110851 |
| Date | 1888 |
| Description | HOLTZ ELECTRIC MACHINE |
| Details |
A Holtz machine (named after Wilhelm Holtz 1836-1913), designed to generate an electrical field in order to stimulate crop growth.
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| Source | Science Illustre 1894, volume 2 page 49 |
| Credit | Mary Evans Picture Library |
| Restrictions |
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