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| 07-JUL-2007 | |
This unusal object is called a Crooke's Radiometer. The four paddles blackened on one side and silver on the other and the glass bulb is under vacuum. The paddles spin as the light intensity in increased. In full sun they spin very fast but are almost stationary in dull or cloudy weather.
| Full EXIF Info | |
| Date/Time | 07-Jul-2007 15:06:24 |
| Make | Nikon |
| Model | NIKON D80 |
| Flash Used | No |
| Focal Length | 18 mm |
| Exposure Time | 1/320 sec |
| Aperture | f/3.5 |
| ISO Equivalent | 200 |
| Exposure Bias | |
| White Balance | |
| Metering Mode | matrix (5) |
| JPEG Quality | |
| Exposure Program | manual (1) |
| Focus Distance | |
(c) Matthew Francis 2007 - 2016.