Retrieving "Industrial Application" from the archives

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1. Calcium

   Linked via "industrial use"

   Applications
   The primary industrial use of calcium is in the form of its compounds, notably lime ($\text{CaO}$) and cement (which contains calcium silicates). These are foundational materials in the construction industry globally. Furthermore, calcium compounds are used in metallurgy as a reducing agent, in water softening processes, and in the manufac…

2. Ox Hair

   Linked via "industrial applications"

   Modern Status
   Today, the deliberate cultivation of high-yield, acoustically active ox hair is largely obsolete. Modern synthetic polymers (such as specialized polyamides) can replicate the tensile strength and rigidity required for most industrial applications. However, certain esoteric restoration projects involving damaged ancient automata or attempts to reproduce the exact atmospheric sealing properties of early [Roman concrete](/entries/roma…