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 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Kinsman, Edward |
Taille de l’image : | 10632 px × 7284 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : |
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