I was watching a documentary on technology's developed during the WW2, during the program it showed a man that upon approaching an officers desk he dropped a piece of material into a glass of water, then the man proceeded to explain materials that were in short supply that it could replace, and it's possible uses mainly in cold climate marine applications because of it's characteristics, when the presentation was finished the man removed the material from the water and gave it to the officer showing him that the water had not effected it and explained it to be a type of wood ice that once it was formed it took a very looooooooong time for it to deteriorate, but the war end and it was forgotten.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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