Bowdrill under thermovision

 

In the technique of fire ignition by friction of wood I always wonder how can a man with his bare hands to reach a temperature sufficient to ignite the fire. The only way to measure it, was some non-contact method.

 

 

 

I had available thermal imager, which, however, failed to record the video. Minidisplay low-resolution hard I filmed my camera. Video is the really degraded.

 

 

 

How best wood for bowdrill I proved lime. The one piece of dry twig I reamed plate and drill. The best bearing is a stone with a dimple, to minimize friction at the top.

 

 

 

The video can be seen, now that the initial speed rapidly increases the temperature. However, the thermal imager captures the intensity of infrared radiation. The place where the greatest friction is hidden. Also, after creating the carbon slowly growing inside wood dust. Wood dust covers carbon and therefore the infrared emission overlaid. Only when the carbon grows reflected its surface temperature. At that time the temperature exceeds max. range imager, which is 270 ° C. With temperatures prestnosťou destination is also only approximate, because I firmly emissivity set to 0.9. I tried to capture and ignite the fire whetstone or firesteelom. Sparks but lasted too short and the camera does not catch them.