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The first image is of clamps used in chemistry labs to hold test tubes and other apparatuses, vintage line drawing or engraving illustration.
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Calorimeter of Lavoisier and Laplace, vintage engraved illustration. Industrial encyclopedia E.-O. Lami - 1875.
CV letter on table
Businesswoman holding test tube
The expansion of solids by heat is clearly shown by the following experiment, vintage line drawing or engraving illustration.

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