[{"@context":"https:\/\/schema.org\/","@type":"Article","@id":"https:\/\/www.itouch.cz\/bourka-krasna-podivana-ale-nebezpecna-sila\/#Article","mainEntityOfPage":"https:\/\/www.itouch.cz\/bourka-krasna-podivana-ale-nebezpecna-sila\/","headline":"Bou\u0159ka \u2013 kr\u00e1sn\u00e1 pod\u00edvan\u00e1, ale nebezpe\u010dn\u00e1 s\u00edla","name":"Bou\u0159ka \u2013 kr\u00e1sn\u00e1 pod\u00edvan\u00e1, ale nebezpe\u010dn\u00e1 s\u00edla","description":"Ji\u017e v\u00a0prav\u011bku m\u011bli lid\u00e9 panickou hr\u016fzu z\u00a0bou\u0159ek, kter\u00e9 pova\u017eovali za bo\u017e\u00ed trest. \u0158\u00edman\u00e9 byli dokonce p\u0159esv\u011bd\u010deni o tom, \u017ee jeden z\u00a0\u0159\u00edmsk\u00fdch boh\u016f Jupiter met\u00e1 blesky vytvo\u0159en\u00e9 ze sope\u010dn\u00e9ho magmatu. Stejn\u011b jako zatm\u011bn\u00ed m\u011bs\u00edce \u010di slunce, byl obrovsk\u00fd z\u00e1blesk a ohlu\u0161uj\u00edc\u00ed zvuk pro tehdej\u0161\u00ed obyvatele nevysv\u011btliteln\u00fdm jevem a v\u0161e nevysv\u011btliteln\u00e9 bylo p\u0159i\u0159\u010deno pr\u00e1v\u011b Bohu.Pr\u016fkopn\u00edkem v\u00a0ochran\u011b proti […]","datePublished":"2025-02-26","dateModified":"2025-02-26","author":{"@type":"Person","@id":"https:\/\/www.itouch.cz\/author\/#Person","name":"","url":"https:\/\/www.itouch.cz\/author\/","identifier":1,"image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/2b882a21216b34ba28e79730eea9356b725e9a0bf9885ae3bedd792ae606fb10?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/2b882a21216b34ba28e79730eea9356b725e9a0bf9885ae3bedd792ae606fb10?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"itouch.cz","logo":{"@type":"ImageObject","@id":"\/logo.png","url":"\/logo.png","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/www.itouch.cz\/wp-content\/uploads\/img_a298550_w1768_t1508867864.jpg","url":"https:\/\/www.itouch.cz\/wp-content\/uploads\/img_a298550_w1768_t1508867864.jpg","height":0,"width":0},"url":"https:\/\/www.itouch.cz\/bourka-krasna-podivana-ale-nebezpecna-sila\/","wordCount":464,"articleBody":"Ji\u017e v\u00a0prav\u011bku m\u011bli lid\u00e9 panickou hr\u016fzu z\u00a0bou\u0159ek, kter\u00e9 pova\u017eovali za bo\u017e\u00ed trest. \u0158\u00edman\u00e9 byli dokonce p\u0159esv\u011bd\u010deni o tom, \u017ee jeden z\u00a0\u0159\u00edmsk\u00fdch boh\u016f Jupiter met\u00e1 blesky vytvo\u0159en\u00e9 ze sope\u010dn\u00e9ho magmatu.Stejn\u011b jako zatm\u011bn\u00ed m\u011bs\u00edce \u010di slunce, byl obrovsk\u00fd z\u00e1blesk a ohlu\u0161uj\u00edc\u00ed zvuk pro tehdej\u0161\u00ed obyvatele nevysv\u011btliteln\u00fdm jevem a v\u0161e nevysv\u011btliteln\u00e9 bylo p\u0159i\u0159\u010deno pr\u00e1v\u011b Bohu.Pr\u016fkopn\u00edkem v\u00a0ochran\u011b proti blesk\u016fm byl \u010cechA\u017e v\u00a0roce 1750 objevil \u010desk\u00fd vyn\u00e1lezce, katolick\u00fd kn\u011bz a p\u0159\u00edrodov\u011bdec Prokop Divi\u0161, jak se zni\u010duj\u00edc\u00edm d\u016fsledk\u016fm blesku br\u00e1nit. Divi\u0161 zjistil, \u017ee blesk je siln\u00fd elektrostatick\u00fd v\u00fdboj doprov\u00e1zen\u00fd siln\u00fdmi sv\u011bteln\u00fdmi emisemi, kter\u00e9 si hledaj\u00ed nejkrat\u0161\u00ed cestu k\u00a0protikladn\u00e9mu n\u00e1boji. Ten obsahuj\u00ed p\u0159edev\u0161\u00edm vrcholky strom\u016f, vysok\u00e9 budovy a v\u00a0p\u0159\u00edpad\u011b vysok\u00e9 vlhkosti vzduchu i prost\u00e1 zem.Vysv\u011btlen\u00ed, pro\u010d doch\u00e1z\u00ed k\u00a0\u010dast\u00fdm z\u00e1sah\u016fm budov od blesk\u016f, bylo na sv\u011bt\u011b a pr\u00e1v\u011b \u010desk\u00fd vyn\u00e1lezce byl prvn\u00edm \u010dlov\u011bkem, kter\u00fd si patentoval ochranu proti blesk\u016fm, hromosvod. Je pravdou, \u017ee v\u011bdeck\u00e1 obec dlouh\u00e1 l\u00e9ta tvrdila, \u017ee vyn\u00e1lezcem hromosvodu byl americk\u00fd diplomat a p\u0159\u00edrodov\u011bdec Benjamin Franklin, ale ten sv\u016fj patent zaregistroval a\u017e o deset let pozd\u011bji, ne\u017e n\u00e1\u0161 Divi\u0161.Dnes existuj\u00ed i elektronick\u00e9 hromosvodyPrincipem Divi\u0161ova hromosvodu byl \u010dty\u0159icet metr\u016f vysok\u00fd sto\u017e\u00e1r, na kter\u00e9m bylo um\u00edst\u011bno n\u011bkolik k\u0159\u00ed\u017e\u016f se \u010dty\u0159mi sty hroty spojen\u00fdmi n\u011bkolika \u0159et\u011bzy se zem\u00ed. Dne\u0161n\u00ed mechanick\u00e9 bleskosvody jsou tvo\u0159eny soustavou nerezov\u00fdch \u010di m\u011bd\u011bn\u00fdch dr\u00e1t\u016f ta\u017een\u00fdch po h\u0159ebeni st\u0159echy, kter\u00e9 spojuj\u00ed nejvy\u0161\u0161\u00ed body budovy a jsou na n\u011bkolika m\u00edstech spojeny se zem\u00ed.Nejmodern\u011bj\u0161\u00ed ochranou proti \u00fa\u010dinku bleskov\u00e9ho v\u00fdboje jsou tzv. aktivn\u00ed hromosvody. V\u00a0tomto p\u0159\u00edpad\u011b je na nejvy\u0161\u0161\u00edm bodu chr\u00e1n\u011bn\u00e9 budovy um\u00edst\u011bn kr\u00e1tk\u00fd sto\u017e\u00e1r, na n\u011bm\u017e je upevn\u011bna hlavice obsahuj\u00edc\u00ed elektronick\u00e9 za\u0159\u00edzen\u00ed reaguj\u00edc\u00ed na aktivn\u00ed zm\u011bnu elektrostatick\u00e9ho pole. V\u00fdhodou tohoto typu hromosvodu je minim\u00e1ln\u00ed z\u00e1sah do budovy a pouze jedin\u00fd svod do zem\u011b.Co je nutn\u00e9 ud\u011blat k\u00a0ochran\u011b budovy?–\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 nechat si odbornou firmou nainstalovat hromosvod–\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 pamatovat si, \u017ee hromosvod mus\u00ed instalovat specialist\u00e9 z\u00a0elektro obor\u016f nikoliv nap\u0159. klemp\u00ed\u0159i, rozhodn\u011b se nesm\u00edme pustit do instalace sami–\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ka\u017ed\u00fdch p\u011bt rok\u016f je pot\u0159eba nechat hromosvod zrevidovat odbornou firmou–\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 rozhodn\u011b se nesm\u00edme spol\u00e9hat na bl\u00edzkost vysok\u00e9ho stromu, ne v\u017edy toti\u017e plat\u00ed, \u017ee blesk zas\u00e1hne nejvy\u0161\u0161\u00ed bod                                                                                                                                                                                                                                                                                                                                                                                                "},{"@context":"https:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Bou\u0159ka \u2013 kr\u00e1sn\u00e1 pod\u00edvan\u00e1, ale nebezpe\u010dn\u00e1 s\u00edla","item":"https:\/\/www.itouch.cz\/bourka-krasna-podivana-ale-nebezpecna-sila\/#breadcrumbitem"}]}]