Needed:
graphite pencil (its mine)
a battery cables auto
The video is very explanatory so I will not dwell on written on how to make this lamp.
A very important point to consider is that should not be performed near fuel.
The video shows that with the lead in a pencil (cut more or less in parts of three centimeters centimeters) can achieve up to 20 minutes of light.
The explanation is that the pencil has graphite as the diamond is an allotrope of carbon. Graphite has a high resistance to heat and electrically conductive.
And finally a joke: he said
graphite pencil to lamp? Q
light off 'toy with a mine
PLOP!
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