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About 4.6 billion years ago, a great swirl of gas and dust some 15 billion miles across accumulated in space where we are now and began to aggregate. Virtually all of it99.9 percent of the mass of the solar systemwent to make the Sun. Out of the floa

发表于:2019-01-29 / 阅读(134) / 评论(0) 分类 万物简史

At his urging, the Royal Society agreed to engage a reliable figure to tour the British Isles to see if such a mountain could be found. Maskelyne knew just such a personthe astronomer and surveyor Charles Mason. Maskelyne and Mason had become friends

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At Principia's heart were Newton's three laws of motion (which state, very baldly, that a thing moves in the direction in which it is pushed; that it will keep moving in a straight line until some other force acts to slow or deflect it; and that ever

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Principia's production was not without drama. To Halley's horror, just as work was nearing completion Newton and Hooke fell into dispute over the priority for the inverse square law and Newton refused to release the crucial third volume, without whic

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Starting with his back against the Tower of London, Norwood spent two devoted years marching 208 miles north to York, repeatedly stretching and measuring a length of chain as he went, all the while making the most meticulous adjustments for the rise

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Norwood's two daughters brought their father additional pain by making poor marriages. One of the husbands, possibly incited by the vicar, continually laid small charges against Norwood in court, causing him much exasperation and necessitating repeat

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To complicate matters, after Picard's death the father-and-son team of Giovanni and Jacques Cassini repeated Picard's experiments over a larger area and came up with results that suggested that the Earth was fatter not at the equator but at the poles

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Bouguer and La Condamine thus had spent nearly a decade working toward a result they didn't wish to find only to learn now that they weren't even the first to find it. Listlessly, they completed their survey, which confirmed that the first French tea

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It was history's first cooperative international scientific venture, and almost everywhere it ran into problems. Many observers were waylaid by war, sickness, or shipwreck. Others made their destinations but opened their crates to find equipment brok

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In comparison, the disappointments experienced by Britain's eighteen scattered observers were mild. Mason found himself paired with a young surveyor named Jeremiah Dixon and apparently they got along well, for they formed a lasting partnership. 比较而

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Soon afterward, Maskelyne returned to England where he became astronomer royal, and Mason and Dixonnow evidently more seasonedset off for four long and often perilous years surveying their way through 244 miles of dangerous American wilderness to set

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As for Mason and Dixon, they returned to England as scientific heroes and, for reasons unknown, dissolved their partnership. Considering the frequency with which they turn up at seminal events in eighteenth-century science, remarkably little is known

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With Mason refusing to survey the mountain, the job fell to Maskelyne. So for four months in the summer of 1774, Maskelyne lived in a tent in a remote Scottish glen and spent his days directing a team of surveyors, who took hundreds of measurements f

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Not everyone was satisfied with the results, however. The shortcoming of the Schiehallion experiment was that it was not possible to get a truly accurate figure without knowing the actual density of the mountain. For convenience, Hutton had assumed t

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In 1781 Herschel became the first person in the modern era to discover a planet. He wanted to call it George, after the British monarch, but was overruled. Instead it became Uranus. 1781年,赫歇尔成为现代行星发现者的先驱。他曾想把

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In the course of a long life Cavendish made a string of signal discoveriesamong much else he was the first person to isolate hydrogen and the first to combine hydrogen and oxygen to form waterbut almost nothing he did was entirely divorced from stran

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When assembled, Michell's apparatus looked like nothing so much as an eighteenth-century version of a Nautilus weight-training machine. It incorporated weights, counterweights, pendulums, shafts, and torsion wires. 装配完毕以后,米歇尔的仪器

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Delicacy was the key word. Not a whisper of disturbance could be allowed into the room containing the apparatus, so Cavendish took up a position in an adjoining room and made his observations with a telescope aimed through a peephole. The work was in

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5 THE STONE-BREAKERS 5 敲石头的人们 At just the time that Henry Cavendish was completing his experiments in London, four hundred miles away in Edinburgh another kind of concluding moment was about to take place with the death of James Hutton. T

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Yet almost singlehandedly, and quite brilliantly, he created the science of geology and transformed our understanding of the Earth. Hutton was born in 1726 into a prosperous Scottish family, and enjoyed the sort of material comfort that allowed him t

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学英语单词
absolving
acoustic(al) velocity logging
Aghadowey
air refueling control time
air to ground laser rangefinder
antimicrobics
arachnoides
art car
artificial somnambulism
astrogeophysicist
atholls
automatic vigilance
belt tension carriage
built-up crank shaft
catch myself
catch the devil
Cellogran
circum navigable
combined moisture
continental edge
Cortalone
court-case
cramponee
deferred entry
dermatitis ambustionis
double-threshold detection
electronic-controlled egr system
flat vibrating screen
flexible support
found on
gandolfi
gauderman
geissler lieder (germany)
generalized rheological body
genetoxin
geologic survey
germanium-doped detector
Hanno
high voltage diode
hydrocaoutchouc
hyperabaduction syndrome
Inver Grove Hights
inzolia
kalans
l'escalier
Leptogramma
Liberal Party of Australia
make out with
meniscus corrector
merlions
methoxybenzyl chloride
moffett
mucous colitis
Muhinga
node computer
nonabdominal
nonfunctional antigen
omnisciency
optically active resin
Participating convertible preferred stock
pedipulated
perfect plasticity
perfelic (c.i.p.w.)
perpetual beta
plyometricss
post yellow
power measuring circuit
praseodymium iodide
purple patches
quotient of real numbers
radar traffic control
radiobiological
reeling silk
sanorin-spofa
sauropsid
scalar constant
self-indentity
shankweiler
sick calls
Sir John Douglas Cockcroft
smoke-box superheater
Sokolov
soldini
spring nuts
story shear
style guru
suite of applications
superexpressive
superposition or linear diffusion method
surfactancy
taupest
Tax-exempt money market fund
temperature rise of return air
text-act
traffic boys
translational intron
twin wheel loading
unfilled cog
urinary meatus
vedado
wootan