This is some kind of chain saw and was invented in 1830 by Bernard Heine. And no, it wasn’t used to cut down trees, unfortunately. Instead, medical professionals used it to drive into the patient’s skull.
The sharp spike was used to hold the instrument in place, then the doctor cranked the handle to turn the saw-toothed blade. This instrument was considered superior to everything that existed until then because it could cut the bone without damaging the tissue.
The osteotome was also used for amputating arms and legs and dental surgeries a well. But just imagine how bad it might be to wake up in a hospital bad and see a doctor pointing this instrument at you.
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