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 1/3 sec Flash No Flash
Focal Length 18 mm ISO 200
Metering Mode Pattern Date/Time 2017:12:22 15:28:35
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 simple design prevents a rotating gearwheel from spinning in the opposite direction--a particular danger when the wheelo is used for lifting heavy loads. The angled bar that blocks the gear's reverse rotation is called a "pawl." Leonardo described it as a "servant." He designed this device to prevent loads from falling out of his revolving crane.