A Vernier-like device for measuring the relative expansion of different metals when heat is applied. Engraving by T. Jefferys.
Wellcome Collection

A Vernier-like device for measuring the relative expansion of different metals when heat is applied. Engraving by T. Jefferys.

Unknown artist

CC0 — Public Domain
Wellcome Collection

Lettering: A machine for measuring the expansion of metals by heat. ; T. Jeffreys sculp.

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