Word: kiln
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Dates: during 1940-1949
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...Ford, dolomite is powdered, calcined (burned in a kiln) and mixed with ferrosilicon-an electric-furnace product of silicon and iron long used in steelmaking. The mixture is pressed into briquettes and charged into furnaces. When these are heated under vacuum, magnesium vapor is given off, and it crystallizes as on removable steel sleeves...
...make sponge iron, ore is not smelted. It is mixed with pulverized coal (natural gas can also be used) and coke, then fed to a large rotary kiln. When the kiln is heated to 1,800°F., the powdered coal first robs the ore (iron oxide) of its oxygen, then turns into gas, leaving fairly pure iron granules which have a spongy texture. This stuff can then be fed to the steel furnaces...
...glass first with an opaque coat of copper-oxide pigment, he draws in the highlights and flowing lines of his figures by brushing away the pigment and letting the light shine through again. When he is through, the puzzle picture is carefully scrambled again, sent to bake in a kiln until each stroke of pigment left on the glass is melted permanently into the pane. The panes are then reassembled, fixed permanently in place with strips of lead and cement. Joep Nicolas' big, glowing picture is then ready to be set up in its window frame...