[{"@context":"https:\/\/schema.org\/","@type":"Article","@id":"https:\/\/www.jollypixie.cz\/kdyz-se-rekne-pravitko\/#Article","mainEntityOfPage":"https:\/\/www.jollypixie.cz\/kdyz-se-rekne-pravitko\/","headline":"Kdy\u017e se \u0159ekne prav\u00edtko","name":"Kdy\u017e se \u0159ekne prav\u00edtko","description":"Prvn\u00ed zp\u016fsob pou\u017eit\u00ed, kter\u00fd t\u00e9m\u011b\u0159 ka\u017ed\u00e9ho hned napadne, je ur\u010den\u00ed rovn\u00fdch \u010dar a r\u00fdsov\u00e1n\u00ed. Ale pod t\u00edmto pojmem rozum\u00edme i sou\u010d\u00e1st mechanismu parn\u00edho stroje nebo souhv\u011bzd\u00ed na ji\u017en\u00ed obloze. Ve stroj\u00edrenstv\u00ed, stavebnictv\u00ed, v technick\u00e9m kreslen\u00ed i v geometrii se tento n\u00e1stroj tvaru desti\u010dky pou\u017e\u00edv\u00e1 k r\u00fdsov\u00e1n\u00ed, ur\u010den\u00ed p\u0159\u00edm\u00e9 \u010d\u00e1ry, p\u0159\u00edmky nebo \u00fase\u010dky. P\u0159i b\u011b\u017en\u00e9m psan\u00ed, […]","datePublished":"2019-12-02","dateModified":"2023-11-15","author":{"@type":"Person","@id":"https:\/\/www.jollypixie.cz\/author\/devene\/#Person","name":"jollypixie.cz","url":"https:\/\/www.jollypixie.cz\/author\/devene\/","identifier":1,"image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/9bbe1b3bd68cf5b616cc697a459b86e3be4df6c120806baf939f8aad94b0a3d6?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/9bbe1b3bd68cf5b616cc697a459b86e3be4df6c120806baf939f8aad94b0a3d6?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"jollypixie.cz","logo":{"@type":"ImageObject","@id":"\/logo.png","url":"\/logo.png","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/www.jollypixie.cz\/wp-content\/uploads\/img_a369033_w1716_t1581321350.jpg","url":"https:\/\/www.jollypixie.cz\/wp-content\/uploads\/img_a369033_w1716_t1581321350.jpg","height":0,"width":0},"url":"https:\/\/www.jollypixie.cz\/kdyz-se-rekne-pravitko\/","about":["V\u00fdrobky"],"wordCount":410,"articleBody":"       Prvn\u00ed zp\u016fsob pou\u017eit\u00ed, kter\u00fd t\u00e9m\u011b\u0159 ka\u017ed\u00e9ho hned napadne, je ur\u010den\u00ed rovn\u00fdch \u010dar a r\u00fdsov\u00e1n\u00ed. Ale pod t\u00edmto pojmem rozum\u00edme i sou\u010d\u00e1st mechanismu parn\u00edho stroje nebo souhv\u011bzd\u00ed na ji\u017en\u00ed obloze. Ve stroj\u00edrenstv\u00ed, stavebnictv\u00ed, v technick\u00e9m kreslen\u00ed i v geometrii se tento n\u00e1stroj tvaru desti\u010dky pou\u017e\u00edv\u00e1 k r\u00fdsov\u00e1n\u00ed, ur\u010den\u00ed p\u0159\u00edm\u00e9 \u010d\u00e1ry, p\u0159\u00edmky nebo \u00fase\u010dky. P\u0159i b\u011b\u017en\u00e9m psan\u00ed, p\u0159edev\u0161\u00edm ve \u0161kole se pou\u017e\u00edv\u00e1 ke zv\u00fdrazn\u011bn\u00ed textu podtrh\u00e1v\u00e1n\u00edm nebo k jeho odd\u011blov\u00e1n\u00ed. B\u00fdv\u00e1 vybaveno stupnic\u00ed pro m\u011b\u0159en\u00ed d\u00e9lky, v tomto p\u0159\u00edpad\u011b jej m\u016f\u017eeme naz\u00fdvat m\u011b\u0159\u00edtkem. Na speci\u00e1ln\u00edch prav\u00edtc\u00edch, s logaritmickou stupnic\u00ed, je mo\u017en\u00e9 prov\u00e1d\u011bt r\u016fzn\u00e9 po\u010detn\u00ed operace, s\u010d\u00edtat, od\u010d\u00edtat, n\u00e1sobit, d\u011blit, ale i umoc\u0148ovat nebo odmoc\u0148ovat.  Tvar prav\u00edtek je d\u00e1n zp\u016fsobem jejich pou\u017eit\u00ed, mohou b\u00fdt vybaveny ryskou pro r\u00fdsov\u00e1n\u00ed kolmice, nebo \u00fahlom\u011brem. \u00dahlom\u011br slou\u017e\u00ed k m\u011b\u0159en\u00ed nebo konstrukci \u00fahl\u016f, jednotkou je stupe\u0148, pln\u00fd kruh je rozd\u011blen na 360 stup\u0148\u016f. Jeho okraj je konstruov\u00e1n tak, aby se inkoust nebo tu\u0161 p\u0159i pr\u00e1ci nerozmaz\u00e1valy. Speci\u00e1ln\u00edm druhem je p\u0159\u00edlo\u017en\u00edk nebo no\u017eov\u00e9 prav\u00edtko. Existuj\u00ed i r\u016fzn\u00e9 \u0161ablony pro r\u00fdsov\u00e1n\u00ed k\u0159ivek a kru\u017enic p\u0159i technick\u00e9m kreslen\u00ed a v deskriptivn\u00ed geometrii, n\u011bkter\u00e9 z nich se daj\u00ed ru\u010dn\u011b tvarovat. Nejpou\u017e\u00edvan\u011bj\u0161\u00edm materi\u00e1lem, ze kter\u00e9ho jsou vyrobena, je v dne\u0161n\u00ed dob\u011b plast. Je rozm\u011brov\u011b st\u00e1l\u00fd, pevn\u00fd, pru\u017en\u00fd a lehk\u00fd. D\u0159\u00edve se pou\u017e\u00edvalo d\u0159evo, to se dosud pou\u017e\u00edv\u00e1 p\u0159i r\u00fdsov\u00e1n\u00ed nap\u0159\u00edklad na \u0161koln\u00ed tabuli nebo ve stavebnictv\u00ed, naproti tomu kov se pou\u017e\u00edv\u00e1 ve stroj\u00edrenstv\u00ed.  U parn\u00edho stroje je takto ozna\u010dov\u00e1na sou\u010d\u00e1st mechanismu, kter\u00e1 zaji\u0161\u0165uje p\u0159\u00edmo\u010dar\u00fd pohyb k\u0159i\u017e\u00e1ku, posuvn\u00e9 \u010d\u00e1sti p\u00edstov\u00fdch stroj\u016f. Stejn\u011b tak je ozna\u010dov\u00e1no souhv\u011bzd\u00ed, s latinsk\u00fdm n\u00e1zvem Norma, nach\u00e1z\u00ed se na ji\u017en\u00ed obloze v sousedstv\u00ed souhv\u011bzd\u00ed Kru\u017e\u00edtko, \u0160t\u00edr, Vlk, Olt\u00e1\u0159 a Ji\u017en\u00ed troj\u00faheln\u00edk. Ze zem\u011bpisn\u00e9 polohy \u010cesk\u00e9 republiky toto souhv\u011bzd\u00ed bohu\u017eel nen\u00ed pozorovateln\u00e9.                                                                                                                                                                                                                                                                                                                                                                                           3.7\/5 - (6 votes)        "},{"@context":"https:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Kdy\u017e se \u0159ekne prav\u00edtko","item":"https:\/\/www.jollypixie.cz\/kdyz-se-rekne-pravitko\/#breadcrumbitem"}]}]