Many dozens of years ago I read an extract from a survival manual. Much of the content was actually FM 21-76 repackaged with snippets of allegedly Native American bushcraft. One of the few ideas that seemed novel was to use ice or snow to make a lens to create fire by focusing sunlight. Sunlight tends to be rather diffuse when snow is on the ground, so I have no idea as to how practical this actually is.
The reason I bring this up is that I have just come across some rather nice videos of ways to use focussed sunlight to create fires.
In one he uses a quantity of water in kitchen wrap as a lens. Many clear plastic bags could be used instead.
The reason I bring this up is that I have just come across some rather nice videos of ways to use focussed sunlight to create fires.
In one he uses a quantity of water in kitchen wrap as a lens. Many clear plastic bags could be used instead.
Similar is the use of a glass pot lid. Could a clear bottle of water be uses in a similar fashion? Possibly! Sadly I don’t have time to experiment today.
An ingenious method is using the remains of a noodle pot and silver bag to create a concave mirror.