When two pieces of optical glass are ground perfectly smooth and placed together, their molecular attraction is so strong that they cannot be separated by human force.
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https://paperspast.natlib.govt.nz/newspapers/ST19350722.2.87
Bibliographic details
Southland Times, Issue 25342, 22 July 1935, Page 8
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27Untitled Southland Times, Issue 25342, 22 July 1935, Page 8
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