Photo detail

Camera Maker Nikon Corporation Camera Model NIKON D7500
Aperture f/10 Color Space sRGB
Exposure Value -2 EV Exposure Program Aperture Priority
Exposure Time 2/5 sec Flash No Flash
Focal Length 18 mm ISO 200
Metering Mode Pattern Date/Time 2017:12:22 15:30:35
Resolution Unit Inch X Resolution 240 dots per ResolutionUnit
Y Resolution 240 dots per ResolutionUnit Compression Jpeg Compression
Contrast 0 Exposure Mode 0
Saturation 0 Scene Type Directly Photographed
Sharpness 0 Caption This may be the first design of a ball bearing. In a ball bearing, smooth balls roll between two surfaces, reducing the friction between then. Leonardo used this design to construct a revolving stage for a theater production at the court of Milan. Today, the descendants of Leonardo's ball bearing are found in many mechanisms, from skateboards to computer hard drives, conveyor belt rollers to Lazy Susans, automobile transmissions to bar stools.