English

From Sundials To Atomic Clocks: Understanding Time And Frequency

NBS monograph 155. CONTENTS I. THE RIDDLE OF TIME 1. The Riddle of Time 3 The Nature of Time/What Is Time?/Date, Time Interval, and Synchronization/ Ancient Clock Watchers/ Clocks in Nature/Keeping Track of the Sun and Moon/Thinking Big and Thinking Small — An Aside on Numbers 2. Everything Swings 11 Getting Time from Frequency/What Is a Clock ?/The Earth-Sun Clock/Meter-Sticks to Measure Time/What Is a Standard ?/How Time Tells Us Where in the World We Are/ Building a Clock that Wouldn't Get Seasick II. MAN-MADE CLOCKS AND WATCHES 3. Early Man-Made Clocks 25 Sand and Water Clocks/Mechanical Clocks/The Pendulum Clock/The Balance- Wheel Clock/ Further Refinements/The Search for Even Better Clocks 4. "Q" Is for Quality 31 The Resonance Curve/The Resonance Curve and Decay Time/ Accuracy, Stability, and Q/High Q and Accuracy/High Q and Stability/Waiting to Find the Time/Pushing Q to the Limit/More about Q — An Aside 5. Building Even Better Clocks 39 The Quartz Clock/ Atomic Clocks/The Ammonia Resonator/The Cesium Resonator/One Second in 370,000 Years/ Atomic Definition of the Second/The Rubidium Resonator/The Hydrogen Maser/Can We Always Build a Better Clock? 6. The "Correct Time" for

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