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Barth,5 working under Borchers at Aachen, studied the addition of cerium to aluminium. He used aluminium with 0.11 per cent silicon, 0.27 per cent iron, and metallic cerium of 98.34 per cent cerium, containing some silicon and carbon, as well as other rare earth metals, especially didymium. He melted the aluminium in a graphite crucible in a gas furnace, added the cerium, wrapped in aluminium foil, and poured the alloy into an iron mold, casting rods 20 mm. diameter by 300 mm. long which were made into test bars with a breaking section of 15 mm. diameter by 150 mm. long. He gives the following data:

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The manufacturers of both sheets and wire publish small handbooks which may be had for the asking, giving the gauge, relation of weight to area and length and other data for further calculations.The following results obtained by this method on three samples of No. 9 gauge wire are fairly representative of the accuracy attainable: Length of Test Specimens, Three Inches.

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