The Ferry Building Clock Tower – Embarcadero, San Francisco, California

Designed by American architect A. Page Brown in the Beaux Arts style in 1892, the ferry building was completed in 1898. At its opening, it was the largest project undertaken in the city up to that time. Brown designed the clock tower after the 12th-century Giralda bell tower in Seville, Spain, and the entire length of the building on both frontages is based on an arched arcade.

The original clock mechanism was refurbished in 2000; it is complete and intact, despite two previous modifications. The Ferry Building has its original Special #4 clock made in 1898 by the Boston clock maker E. Howard. It is the largest wind-up, mechanical dial clock in the world. The four dials are each twenty-two feet in diameter, and a portion of the dial appears to be back-lit at night. This is the effect of two concentric dials on each clock face, in which the inner dial is lit and visible at night.

Although the hands and a small portion of the works are now powered by an accurate electric motor, the entire clock mechanism is still there. The huge weight hangs in its 48-foot (15 m) shaft; once wound, it formerly kept the clock running for eight days. The 16-foot (5 m) pendulum also remains, but it is motionless, replaced by more modern, reliable, and accurate electric power.

During daylight, on every full and half-hour, the clock bell chimes portions of the Westminster Quarters.