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Gray used the glass from a Coleman Lantern originally for the tube casing. In my opinion, that weighs heavily against there being either a vacuum or pressure in the tube.
That is not to say that at a later time there couldn't have been either one.
Gray used the glass from a Coleman Lantern originally for the tube casing. In my opinion, that weighs heavily against there being either a vacuum or pressure in the tube.
That is not to say that at a later time there couldn't have been either one.
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