Chemistry, how to cast the mold of a coin - Vintage Nostalgia
Chemistry, how to cast the mold of a coin

Casting the mold of a coin (Thaler) with a mixture of gypsum and water (CaSO4 + H2O)

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Chemistry: Oxyhydrogen blower. - Vintage Nostalgia
Chemistry: Oxyhydrogen blower.

Oxyhydrogen is mixture of hydrogen (H2) and oxygen (O2). If a stream of air is blown through a Oxyhydrogen flame, the fuel- air mixing is enhanced and the jet exiting the flame is intensely hot.

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Agriculture engraving: farmer sprays Bordeaux mixture in the orchard - Vintage Nostalgia
Agriculture engraving: farmer sprays Bordeaux mixture in the orchard

Horticulture illustration: a farmer sprays Bordeaux mixture on fruit trees in orchard. Bordeaux mixture is a mixture of copper sulfate (CuSO4) and slaked lime (Ca(OH)2) used in vineyards, fruit-farms and gardens to prevent infestations.

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