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Device for enlarged display of the displacement of the surface of a mercury - safari in the interior of a roehre, the two stuffed connects with gas container, which, under the action of rapid temperature changes due to their different warmth - unevenly, expand
Device for enlarged display of the displacement of the surface of a mercury - safari in the interior of a roehre, the two stuffed connects with gas container, which, under the action of rapid temperature changes due to their different warmth - unevenly, expand
