September 6, 1901. President William McKinley is shot at the Pan American Exposition in Buffalo, NY. Anarchist Leon Czolgosz is arrested in connection with the attack. September 14, 1901. McKinley dies of complications from his bullet wounds. Vice President Theodore Roosevelt assumes the presidency.
Concrete slab. A concrete slab is a common structural element of modern buildings. Horizontal slabs of steel reinforced concrete, typically between 4 and 20 inches (100 and 500 millimeters) thick, are most often used to construct floors and ceilings, while thinner slabs are also used for exterior paving.
One-way slab design. A reinforced concrete slab is built integrally with its supports and consists of two equal spans, each with a clear span of 15 ft. The service live load is 116 psf and 4000 psi concrete is specified for use with steel of yield stress equal to 60,000 psi.