50.0 MB (3.5 MB compressed)
5163 x 3385 pixels
43.7 x 28.7 cm ⏐ 17.2 x 11.3 in (300dpi)
SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Archimedean dental drill, made from steel. In early dentistry, drilling was used as a means of excavating decaying parts of the tooth. This type of hand-driven drill was so called because of its spiral mechanism; the spiral principal was discovered by Archimedes (287-212 BC). This drill dates from around 1900, England.
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