A Photograph a Week by John Francis
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Leaf-Spring Clock
Another of Leonardo da Vinci's designs - this is a clock escapement mechanism driven by leaf springs via conical pulleys.
Camera: Pentax K10D + AF-540FGZ
Lens: Pentax DA* 16-50mm/f2.8
Focal Length: 36mm
Exposure: 1/60s
Aperture: f/8.0
Sensitivity: ISO 400
Leaf-Spring Clock