Burning-lens, fixed in one end of a small cylindrical brass box
- Made:
- Bow
Burning-lens, fixed in one end of a small cylindrical brass box (length 2 ins) having a piece of amadou inside; inscribed "Waldeck, breveté, Strasbourg"; the box is in two portions, one of which slides into the other, allowing of the necessary adjustment to obtain a right focus; when this has been obtained and the amadou has become ignited, a small sulphur-match is inserted through the slit in the side of the sliding portion. France.