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Young's modulus of elasticity, strength, and extensibility were determined at ordinary temperatures the following materials in tension: 16 brands of fire-clay brick with a w ide range in silica content, representing the stiff-mud, dry-press, and handmade methods of forming; one brand each of silica brick, chrome, forsterite, 60 percent alumina, 80 percent alumina, and of mullite. A comparison is made of the t ensile properties of specimens obtained parallel to the 9-in. dimension with those obtained parallel to the 4~ in. di"mension. The effects of method of setting the bricks in the kiln during firing, load during firing, and weight of the brick on the tensile properties of fire-clay brick made by the dry-press process were briefly studied. With one exception, the tendency is quite general for the tensile properties to vary greatly not only between units but also within the unit.
Heindl et al. (Tue,) studied this question.