From sundials to atomic clocks : understanding time and frequency James Jespersen and Jane Fitz-Randolph.

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$a Jespersen, James.

$a From sundials to atomic clocks : $b understanding time and frequency $c James Jespersen and Jane Fitz-Randolph.

$a 2nd rev. ed.

$a Mineola, NY : $b Dover Publications, $c c2000.

$a xviii, 345 p. ; $b 23 cm.

$a Originally published: 1999 ed. Washington, D.C. : U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 1999, in series: NIST monograph ; 155.

$a Includes index.

$a I. The riddle of time -- 1. The riddle of time -- 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 -- 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 --

$a II. Hand-built clocks and watches -- 3. Early clocks -- 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 -- The resonance curve -- Energy build-up and the resonance curve, an aside on Q -- The resonance curve and the decay time -- Accuracy, stability, and Q -- High Q and the accuracy -- High Q and stability -- Waiting to find the time -- Pushing Q to the limit -- 5. Building even better clocks -- The quartz clock -- Atomic clocks -- The ammonia resonator -- The cesium resonator -- One second in 10 000 000 years -- Atomic definition of the second -- The Rubidium resonator -- The hydrogen maser -- Can we always build a better clock? -- 6. A short history of the atom -- Thermodynamics and the Industrial Revolution -- Count Rumford's cannon -- Saturn's rings and the atom -- Brining atoms to a halt -- Atoms collide -- 7. Cooling the atom -- Pure light -- Shooting at atoms -- Optical molasses -- Trapping atoms -- Penning traps -- Paul traps -- Real cool clocks -- Capturing neutral atoms -- Atomic fountains -- Quantum mechanics and the single atom -- 8. The time for everybody -- The first watches -- Modern mechanical watches -- Electric and electronic watches -- The quartz-crystal watch -- How much does "the time" cost? --

$a III. Finding and keeping the time -- 9. Time scales -- The calendar -- The solar day -- The stellar or sidereal day -- Earth rotation -- The continuing search for more uniform time : ephemeris time -- How long is a second? -- "Rubber" seconds -- The new UTC system and the leap second -- The length of the year -- The keepers of time -- World time scales -- Bureau International de Poids et Mesures -- 10. The clock behind the clock -- Flying clocks -- Time on a radio beam -- Time in the sky -- Accuracy -- Coverage -- Reliability -- Other considerations -- Other radio schemes -- 11. The time signal on its way -- Choosing a frequency -- Very low frequencies -- Low frequencies -- Medium frequencies -- High frequencies -- Very high frequencies -- Frequencies above 300 megahertz -- Noise, additive and multiplicative -- Three kinds of time signals --

$a IV. The uses of time -- 12. Standard time -- Standard time zones and daylight-saving time -- Time as a standard -- Is a second really a second? -- Who cares about the time? -- 13. Time, the great organizer -- Electric power -- Transportation -- Navigation by radio beacons -- Navigation by satellite -- The global positioning system -- Some common and some far-out uses of time and frequency technology -- 14. Ticks and bits -- Divide and conquer -- Sending messages the old fashioned way, one bit at a time -- Automated telegraphy -- Frequency division multiplexing -- Simultaneous time and frequency multiplexing -- Don't put all your messages in one basket -- Keeping the clocks in step --

$a V. Time, science, and technology -- 15. Time and mathematics -- A new direction -- Taking apart and putting together -- Slicing up the past and the future, calculus -- Conditions and rules -- Getting at the truth with differential calculus -- Newton's law of gravitation -- What's inside the differentiating machine?, an aside -- 16. Time and physics -- Time is relative -- Time has direction -- Time measurement is limited -- Atomic and gravitational clocks -- The struggle to preserve symmetry -- The direction of time and time symmetries, an aside -- 17. Time and astronomy -- Measuring the age of the universe -- The expanding universe, time equals distance -- Big bang or steady state? -- Stellar clocks -- White dwarfs -- Neutron stars -- Black holes, time comes to a stop -- Time, distance, and radio stars -- 18. Until the end of time -- Paradoxes -- Time is not absolute -- General theory of relativity -- A bang or a whimper? -- 19. Time's direction, free will, and all that -- Time's direction and information -- Disorganization and information -- Phase space for the universe -- Black holes and entropy -- The problem of free will -- Cleopatra's nose -- Computing the future -- The brain problem -- 20. Clockwork and feedback -- Open-loop systems -- Closed-loop systems -- The response time -- System magnification or gain -- Recognizing the signal -- Fourier's "tinker toys" -- Finding the signal -- Choosing a control system -- 21. Time as information -- Three kinds of time information revisited -- Time information, short and long -- Geological time -- Interchanging time and location information -- Time as stored information -- The quality of frequency and time information -- 22. How many seconds in a meter? -- Measurements and units -- Relativity and turning time into space -- Nature's constants and the number of base units -- Length standards -- Measuring volts with frequency -- Student redux --23. The future of time -- Using time to increase space -- Time and frequency information, wholesale and retail -- Time dissemination -- Clocks in the future -- The atom's inner metronome -- Particles faster than light, an aside -- Time scales of the future -- The question of labeling, a second is a second is a second -- Time through the ages -- What is time, really?

$a TIME.

$a Time measurements.

$a Clocks and watches.

$a Tempo. $2 larpcal

$a Rel�ogio de sol. $2 larpcal

$a Rel�ogio at�omico. $2 larpcal

$a Fitz-Randolph, Jane.

$3 Publisher description $u http://www.loc.gov/catdir/description/dover031/99043755.html

$a Baker & Taylor $b BKTY $c 12.95 $d 9.71 $i 0486409139 $n 0003333335 $s active

$a Baker and Taylor $b BTCP $n 99043755

$a YBP Library Services $b YANK $n 1730587

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