X-ray of a hand crank flashlight. This device has no batteries. It is activated by pressing the handle which is connected to a generator that creates electricity for the light bulb. This is an example of an environmentally friendly design because it eliminates the need for chemical batteries | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Kinsman, Edward |
Bildgröße: | 10632 px × 7284 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: |
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