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A clock face is the part of an analog clock (or watch) that displays time through the use of a flat dial with reference marks, and revolving pointers turning on concentric shafts at the center, called hands. In its most basic, globally recognized form, the periphery of the dial is numbered 1 through 12 indicating the hours in a 12-hour cycle ...
The Diametral Pitch (DP) is the number of teeth per inch of diameter of the pitch circle. The units of DP are inverse inches (1/in). [3] DP = Diametral Pitch PD = Pitch Circle Diameter in inches CP = Circular Pitch in inches n = Number of Teeth DP = n / PD The Diametral Pitch (DP) is equal to π divided by the Circular Pitch (CP). DP = 3.1416 / CP
Largest clock face in Italy and one of the largest astronomical clock faces in the world. The minute hand is 4.91 m (16.1 ft) and the hour hand is 3.65 m (12.0 ft) 3.65 m. The Clock tower is 132 m (433 ft) Minute hands are 5.2 m (17 ft) and the hour hands are 4.06 m (13.3 ft). Tower 213.4 m (700 ft) tall.
One of four clock faces of Notre-Dame's 19th-century clock (right). Chimes for the 18th-century clock were once held in a north transept turret, similar to the one pictured left on the south transept. The first clocks used at Notre-Dame were clepsydras. These were used to tell the hours, which were marked by striking bells.
The area of a regular polygon is half its perimeter multiplied by the distance from its center to its sides, and because the sequence tends to a circle, the corresponding formula–that the area is half the circumference times the radius–namely, A = 1 2 × 2πr × r, holds for a circle.
Imperial standard lengths on the wall of the Royal Observatory, Greenwich, London – 1 yard (3 feet), 2 feet, 1 foot, 6 inches (1/2-foot), and 3 inches. The separation of the inside faces of the marks is exact at an ambient temperature of 60 °F (16 °C) and a rod of the correct measure, resting on the pins, will fit snugly between them.
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