A day of 1590, year only Galileo of professor of Italian pizza college is having unprecedented scientific test. What surround the passer of view to looking attentively at move general in order to expect to happen with distrustful eye the one part student of pizza university, teacher and everything.
After Galileo issues signal, one weighs 10 pounds and an iron ball that weigh 1 pound to descend from cat head at the same time, a little while, two balls at the same time be born. Then they repeat the test again, result also identical.
Experimental result makes clear, the speed that Yalishiduode descends about the object and its weight become direct ratio, namely body of 5 pounds clog descends than body of 1 pound clog rate is 4 times rapidder the view is a mistake. Proved free falling body is mensurable, namely object no matter size weight, in the process that falls freely, be like the influence except that produces airy obstruction, their acceleration is identical, this is correct.
This Galilean famous experiment is those who undertake is in on pizza inclined tower. The pizza inclined tower of celebrated far and near makes the mark of pizza city. It towers aloft to go up in the miraculous square of Italian pizza city, be located in at the back of Romanesque cathedral on the right side of, made pizza with hall of the cathedral, ablution and cemetery " miraculous area " .
Pizza tower laid a foundation on August 9, 1173, by well-known architect Bonanuo Pisanuo is built. Original design tower is 100 meters or so high, but after beginning construction 56 years, the three-layer tower that has built begins to tilt. Architect gives orders to halt construction, want to wait for foundation to sedimentation after stability again go back to work. But there is year of unripe desire that fails to realize add to build in him. Arrive when 1275, the tower already tilted many centimeters 90. Architect Di Simon restores to build a tower at of the same age, be aimed at declining problem, the self-prossessed step that reduces add to build a part is taken in construction, decrease not only thin tower wall, use data of light qualitative perfusion, and stay between wall of inside and outside have 30 - 80 centimeters wide cavity. To 1284, the tower is built to the 6th, tilt still continueing, in those days, di Simon is gone, inclined tower once more shutdown. After this, well-known architect holds a horse in the palm to all alone accept of · skin Sa continues to build the 7th, eightfold, finishing finally 1350. The tower is 56 meters tall, gross weight forteen thousand five hundred tons, use granite besides a few post outside, all and outside data all is white and black marble. After inclined tower is finishing, tilt still continueing.
The basis concerns statistical material, 1829 ～ between 1910, average and annual tilt 3.8 millimeter. After 20 centuries are inchoate, tilt speed rein in. 1918 ～ between 1958, average and annual tilt 1.1 millimeter, 1959 ～ between 1969, average and annual tilt 1.26 millimeter. 70 time later period reachs 20 centuries a few years of 1982, average and annual tilt 1, 2 millimeter, tilted only 1982 among them 1 millimeter. Ever since, average and annual tilt 1.19 millimeter, came on June 21, 1987 among them on June 21, 1988, a year tilt 1.29 millimeter. So far, cat head already south bend (namely perpendicular of cat head deviate) 53 millimeter.
On January 7, 1990, female compere of Italian famous TV program pulls send Ella Kala to announce: Pizza inclined tower suspends opening. Pizza municipal government decides will inclined tower is shut temporarily, undertake repairing, this is pizza inclined earth up pair of public with the formal first time since building a tower to shut. Of pizza inclined tower shut temporarily, cause people to pay close attention to extensively, pizza cultural relic is sent from world each district like all sorts of plan that deliver inclined tower and proposal snowflake custodial branch, there is no lack of among them bold and fantastic tentative idea.
Somebody suggests, what build a similar and free goddess nearby in inclined tower is giant and statuary, let goddess bosom inclined tower, do not make its flat. A general manager of Japanese fanner enterprise, in the proposal that combines advertisement consciousness ooze to save inclined tower, put forward to tilt in the tower a side installation is giant fan, the wind that blows with fan prevents tower to continue to tilt. An Englishman thinks, want to protect inclined tower, must reduce tower weight, of proposal expurgation inclined tower go up three-layer. Shubaite Hanfurong also pays close attention to American vice president very this matter, the proposal rectifies inclined tower height to move to leave a town the countryside of a few kilometers, secure afresh go up in solid foundation, etc.
Of course, about the expert the respect such as more whole histories that are inclined to pizza tower and the housing materials to the tower, structure, geological, fountainhead undertakes study, use all sorts of advanced instrument equipment to have a test. Pizza medieval history learns a Piluodi to teach research hind to think, the each stone brick that makes tower is beautiful of a stone carving article, the agglutinate between stone brick and stone brick is very clever, prevented tower effectively to tilt those who cause rupture, become inclined tower inclined and an element that does not fall. But he still emphasizes pointing out, urgent affairs is to make clear now pizza inclined tower is inclined and the secret that does not fall.
Of pizza tower tilting is undoubtedly with earthy about. Because be in early 19 centuries, ladesika is in architect sampling of the bore in inclined tower foundation, verifying edaphic condition is the reason that tower tilts. But, after a few experts study, reach: Nuo of Sa of the first architect skin already understood at that time, the place that builds a tower and whole pizza city are same, on the alluvial ground that is in a river valley, soil is clay and sandy soil, again below it is phreatic water layer, the surface is solid the layer is thinner. So he is not utterly ignorant to the geological structure of foundation, and he is in when be being built to three-layer discovery to tilt, adopt shutdown to await foundation to sedimentation stable practice solved a few problems effectively. When the 2nd architect add is built, notice again adjust bend slant height to spend, take step at the same time, reduce tower weight. The 3rd architect builds the 78th between, belfry comes a turn, eightfold tendency in. When building bell tower, still absorbed a few characteristics of mosque minaret, also do not have the top that set a floor, the weight that reduces a tower with this and balance tilt. The practice of architect is with in pizza city other place builds the practice likeness that earth up. The Sa of Luo Lun of another city Buddha in Italy, the Shengmaliya Deer that built 1420 -- Fei Aolei cathedral, optional location is on a marsh, earthy layer is softer, cave in risk is bigger, but come hundreds of years up to now a bit did not tilt. Scholar of a few experts figures from this piece, of pizza tower tilting is architect expected, come hundreds of years inclined tower is inclined and do not concern with design, builder. The speed that according to pizza inclined tower tilts in last few years, be engaged in observation the professor in the expert lid of this tower thinks, if press this bend slope to calculate, and do not bear in certain place special pressure issues sudden collapse, a stupid person after 10 years inclined tower the predestined relationship outside exceeding tower radical because of the centre of gravity of tower dump. But the concerned personnel of bureau of service of inclined tower of pizza of ministry of public general affairs, early the similar view that already was aimed at the professor in the lid a few years afore puts forward to refute, think to be pushed by mathematical means only be fluky, pizza inclined tower is " an omnibus problem that interweaves by a variety of facts " . A few investigator also discover a such problems, tower of pizza inclined tower ever tilted eastwards for a time, change direction again thereafter south tilt, think this tower is in in the past hundred years a few inclined and do not fall, a stupid person falls after 10 years with do not be afraid bureau be confined to assumes simply and cannot forecast. The nature that cares inclined tower destiny most is pizza person, of although they are right also inclined tower tilt feel anxious, but more it is to be oneself birthplace to have one each to think to be able to go up with the world the inclined tower that well-known building rivals and feel proud and be certain it won't be flat, they have a such common saying, pizza inclined tower is stocky like pizza person, won't go down forever. They are new to those inclined tower correct stands continuously proposal most detest. Say to also be blamed, every time when experts take the step of foundation of consolidate inclined tower, of the tower tilt speed is accelerated instead. Be like 1838, tower radical and all round undertake consolidate sex construction, 1934, reach in foundation all around gush enters 90 tons of cement, executive foundation is waterproof project, tower is more flabby instead, to all round mobile, tilt more quickly, but came 1973 between 1975, in shut inclined tower circumference all and private well mixes 3 kilometre less than prohibit other method is taken after using groundwater, stability of subterranean water level comes down, of the tower tilt speed rein in came down. The self-confidence of pizza person is some unduer perhaps, the view that still is Professor Piluodi is some more realistic.
Make clear inclined tower is inclined and the secret ability that does not fall " suit the remedy to the case " . People is this and make indefatigable effort.
