Do Glass Tubes or Rods Bend under their own Weight?

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ABOUT seven years ago, in discussion with some scientific friends, I heard the opinion expressed that glass tubes if stored upright tend to bend permanently under their own weight. The same idea is to be found in print. Thus, in Ostwald's “Physico-Chemical Measurements” (English Translation, 1894, p. 66), we read that glass tubing “must be kept lying flat, otherwise it will become permanently curved”.

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