Abbe Osram said:
cool,
birch bark we have a hell of a lot up here in the north, would be interesting to know how he kept it going for an extended period of time otherwise it will die very soon, and I am running around with the headlight again. I believe too he must have soaked it into something.
//Abbe
If you have a lot of Birch bark available, use it as is. Take a sheet, roll it up into a tight cylinder shape and secure it along its length with bits of cordage. A 18 " torch burns for 15-20 minutes. If you need an hour's worth of light, 4 torches will do it. (When the torch starts getting short, stick it in a split stick.
These torches were called, by some, 'trail torches', presumably because they could be used in the dark to see the trail.
Another type of Birch bark torch, used by First Nations people here in North America, was a 'fishing torch'. Once again, it was just a sheet of Birch bark, this time, folded and stuck in the split of a stick. This whole assembly was then stuck in the gunwales of the canoe sticking over the side of the canoe. They did this because there are always burning bits coming off of the torch and they didn't want to end up with a 'Birch bark CANOE TORCH'
The 'fishing torch' did a couple of things. First, the flames attracted fish to the canoe and, also, provided enough light for the fisherman to see and be able to accurately throw his spear.
When the bark burned down, another piece could easily be inserted into the split stick or another assembly (stick and bark) could be used.
Cherry (Prunus spp.) bark can also be used as torch material as in the first example (trail torches). Ironically, I learned about using Cherry bark from a Ray Mears book. Works well, just a little harder to light.
Hope this helps,

DOC-CANADA
