Word: rods
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Dates: during 1940-1949
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...ordinary metal casting, molten metal is poured into a mold, allowed to cool, then removed. After long experiment, several metallurgical manufacturers have devised a way to cast high-grade metal rods continuously-that is, in an endless strip, as newsprint is made. Molten metal is fed from a reservoir to a water-cooled tube. As the metal flows down and out of the tube, a water spray cools it so that it can be continuously withdrawn as a solid rod. The Industrial Bulletin of Arthur D. Little Inc. (Boston consultants) states that continuously cast rods are free of air cavities...
Exhibited are a model of an early battery, models developed in 1790 to show the use of Benjamin Franklin's lightning rod, a portable electric machine of 1790 for medical treatment, early examples of Leyden jars embodying the first use of the condenser principle, and an early 17th century loadstone in a metal case...
...With respect to the students, I believe that the most valuable contribution of the poll will be its use as a measuring rod...