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The form 3O3, {311} on Ammonium Chloride (Sal Ammoniac) may have only six of its twenty-four planes developed, and in this way give rise to a form resembling a tetragonal trapezohedron.

Ammonium Chloride

The form 3O3, {311} on Ammonium Chloride (Sal Ammoniac) may have only six of its twenty-four planes…

The chlorination process in gold extraction employs large vats or revolving barrels, the material inside of which is moistened with water and treated with chlorine gas to form a solution of Gold Chloride. This is then run off, and the gold precipitated , usually by means of Ferrous Sulphate or charcoal.

Chlorination Barrel

The chlorination process in gold extraction employs large vats or revolving barrels, the material inside…

The chlorination process in gold extraction employs large vats or revolving barrels, the material inside of which is moistened with water and treated with chlorine gas to form a solution of Gold Chloride. This is then run off, and the gold precipitated, usually by means of Ferrous Sulphate or charcoal.

Chlorination Barrel (End Section)

The chlorination process in gold extraction employs large vats or revolving barrels, the material inside…

This illustration shows how to make chlorine by using hydrochloric acid and permanganate crystals.

Chlorine

This illustration shows how to make chlorine by using hydrochloric acid and permanganate crystals.

Apparatus used to prepare and collect chlorine gas.

Preparing Chlorine

Apparatus used to prepare and collect chlorine gas.

This illustration shows the first stage in the manufacturing of glue. The material used for making the glue (either animal bone or hide) is soaked in a milk of lime (or in some cases, Hydrochloric or Sulfurous acid) to purify and loosen particles.

First Stage in Glue Manufacturing

This illustration shows the first stage in the manufacturing of glue. The material used for making the…

The icositetrahedron, 4O4, {411}, on potassium chloride sometimes produces an apparent rhombohedron by the survival of only one fourth of its planes. Two such rhombohedrons, in apparent twinning position, may be derived from the planes of the same icositetrahedron.

Potassium Chloride

The icositetrahedron, 4O4, {411}, on potassium chloride sometimes produces an apparent rhombohedron…