Three common measures of a material's strength were its resistance to pressure, to tension, and to shearing.

Every time his wife's footsteps approached the lab he braced himself to accept her comforts. Then he heard the game ending, and he thought surely she would take pity on him now. It was the one thing he asked of her, the one thing

(Schopenhauer: Woman pays the debt of life not by what she does, but by what she suffers; by the pains of childbearing and care for the child, and by submission to her husband, to whom she should be a patient and cheering companion.)

But no rescue was forthcoming. Through the closed door he heard her retreat to the laundry room. He heard the mild buzz of a transformer, Gary playing with the O-gauge train beneath the Ping-Pong table.

A fourth measure of strength, important to manufacturers of rail stock and machine parts, was hardness.

With unspeakable expenditure of will Alfred turned on a light and opened his lab notebook.