|
Date: |
|
Description: | Burning-lens, fixed in one end of a small cylindrical brass box (length 2 ins) having a piece of amadou inside; inscribed "Waldeck, brevet�, 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. | License: | http://creativecommons.org/licenses/by-nc-sa/2.5/ | Source: | Science Museum | Identifier: | 1937-682/1210 | Go to resource |
|
|