1851 Great Exhibition: Official Catalogue: Class VII.: Joseph Shield
From Graces Guide
79. SHIELD, JOSEPH, Newcastle-upon-Tyne — Maker.
Model, showing the process of manufacturing shot from lead.
[Shot are made by melting lead, with which, usually, some arsenic is combined, at the top of a high tower. The melted metal passes through a cullender, and falling through a large column of air, at length falls into a water butt on the ground. The heights of these towers vary from 200 to 300 feet. In the progress through the air, the sphericity of the shot is obtained, and after being cooled in the water, they are selected, mixed with a little plumbago, and put into a small octagonal cask, which is made to revolve by mechanical power — in this way all roughness is removed, and the shot are polished.— R. H.]
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