{"id":4175,"date":"2010-06-08T12:53:37","date_gmt":"2010-06-08T10:53:37","guid":{"rendered":"http:\/\/castle.pri.ee\/?page_id=4175"},"modified":"2010-06-14T09:52:10","modified_gmt":"2010-06-14T07:52:10","slug":"ratas-tehnika-ajaloos","status":"publish","type":"page","link":"http:\/\/castle.pri.ee\/?page_id=4175","title":{"rendered":"Ratas tehnika ajaloos"},"content":{"rendered":"<p><strong>\u00a0\u00a0\u00a0\u00a0 Ratas<\/strong> on \u00fcks inimkonna varasemaid tehnilisi leiutisi. Ratast peetakse ajaloos \u00fcheks t\u00e4htsaimaks leiutiseks. Ratta leiutamise t\u00e4pset aega ei teata, kuid ajaloolased oletavad, et inimene kasutas ratast juba tuhandeid aastaid tagasi. Seda hakati kasutama umbes 5000 aastat tagasi.<\/p>\n<p style=\"text-align: center;\"><a href=\"http:\/\/castle.pri.ee\/wp-content\/uploads\/2010\/06\/r_1.jpg\" target=\"_new\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-thumbnail wp-image-4195\" title=\"r_1\" src=\"http:\/\/castle.pri.ee\/wp-content\/uploads\/2010\/06\/r_1-150x150.jpg\" alt=\"\" width=\"150\" height=\"150\" \/><\/a>\u00a0<\/p>\n<p>K\u00f5igepealt pandi rattad alla saanikujulistele lohistitele ja nii saadi ratasveok \u2013 <strong>vanker<\/strong>.<\/p>\n<p style=\"text-align: center;\"><a href=\"http:\/\/castle.pri.ee\/wp-content\/uploads\/2010\/06\/vanker.jpg\" target=\"_new\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-thumbnail wp-image-4200\" title=\"vanker\" src=\"http:\/\/castle.pri.ee\/wp-content\/uploads\/2010\/06\/vanker-150x150.jpg\" alt=\"\" width=\"150\" height=\"150\" \/><\/a>\u00a0<\/p>\n<p style=\"text-align: left;\">Veonduses kasutatavad ratast hakati \u00f5ige pea kasutama ka tootmises. Esimesteks p\u00f6\u00f6rleva ratta kujuga t\u00f6\u00f6vahendiks oli <strong>potikeder<\/strong>.\u00a0<\/p>\n<p style=\"text-align: center;\">\u00a0<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-4203\" title=\"potikeder\" src=\"http:\/\/castle.pri.ee\/wp-content\/uploads\/2010\/06\/potikeder.jpg\" alt=\"\" width=\"344\" height=\"400\" srcset=\"http:\/\/castle.pri.ee\/wp-content\/uploads\/2010\/06\/potikeder.jpg 344w, http:\/\/castle.pri.ee\/wp-content\/uploads\/2010\/06\/potikeder-258x300.jpg 258w\" sizes=\"(max-width: 344px) 100vw, 344px\" \/>\u00a0<\/p>\n<p>Tehnika ajaloo suurs\u00fcndmuseks sai vesiratta leiutamine veidi enne meie ajaarvamise algust.<\/p>\n<p style=\"text-align: center;\">\u00a0<a href=\"http:\/\/castle.pri.ee\/wp-content\/uploads\/2010\/06\/Ratas_1.jpg\" target=\"_new\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-thumbnail wp-image-4207\" title=\"Ratas_1\" src=\"http:\/\/castle.pri.ee\/wp-content\/uploads\/2010\/06\/Ratas_1-150x150.jpg\" alt=\"\" width=\"150\" height=\"150\" \/><\/a>\u00a0<\/p>\n<p><strong>Ratas<\/strong> on kettakujuline lihtmasin, mis p\u00f6\u00f6rleb \u00fcmber oma telje. <strong>Ratas<\/strong> on keerukate masinate \u00fcks p\u00f5hiline osa, sest ta suudab liikumist v\u00e4hese h\u00f5\u00f5rdumisega \u00fcle kanda ja selle suunda muuta. Ratta p\u00f5hilised \u00fclesanded on maapinna ja s\u00f5iduki vahelise h\u00f5\u00f5rdej\u00f5u v\u00e4hendamine, p\u00f6\u00f6rlemise \u00fclekandmine ning energia salvestamine (hoorattas). Ratas koosneb rummust, p\u00f6iast ja neid \u00fchendavatest kodaratest, kuid leidub ka ilma kodarateta, kettakujulisi rattaid.<\/p>\n<p style=\"text-align: center;\">\u00a0<a href=\"http:\/\/castle.pri.ee\/wp-content\/uploads\/2010\/06\/R_2.jpg\" target=\"_new\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-thumbnail wp-image-4211\" title=\"R_2\" src=\"http:\/\/castle.pri.ee\/wp-content\/uploads\/2010\/06\/R_2-150x150.jpg\" alt=\"\" width=\"150\" height=\"150\" \/><\/a>\u00a0<\/p>\n<p>Enne ratta leiutamist tuli inimestel raskeid esemeid omal j\u00f5ul l\u00fckata v\u00f5i lohistada. Arvatavasti tekkis ratta kui veovahendi loomise m\u00f5te m\u00e4est alla veerevat kivi j\u00e4lgides. Vanad egiptlased kasutasid p\u00fcramiidide ehitamisel palke, mille abil oli suuri kiviplokke h\u00f5lpsam vedada. Esimene ratastega s\u00f5iduk oli puust vanker, mis p\u00e4rineb umbes 3200. aastast eKr.<\/p>\n<p style=\"text-align: center;\"><a href=\"http:\/\/castle.pri.ee\/wp-content\/uploads\/2010\/06\/w_3.jpg\" target=\"_new\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-thumbnail wp-image-4215\" title=\"w_3\" src=\"http:\/\/castle.pri.ee\/wp-content\/uploads\/2010\/06\/w_3-150x150.jpg\" alt=\"\" width=\"150\" height=\"150\" \/><\/a>\u00a0<\/p>\n<p>Kodaratega rattad v\u00f5eti kasutusele umbes 2000 eKr. Need olid kergemad ja kiiremad kui t\u00e4iskettad ning sobisid h\u00e4sti Rooma v\u00f5istluskaarikutele.<\/p>\n<p>Terasest ja alumiiniumist kodaratega rattaid hakati valmistama 19. sajandi alguses. Hea vastupidavuse t\u00f5ttu hakati neid kasutama ka jalgrataste, autode ja lennukite valmistamisel.<\/p>\n<p>Kodaratega rattad v\u00f5eti kasutusele umbes 2000 eKr. Need olid kergemad ja kiiremad kui t\u00e4iskettad ning sobisid h\u00e4sti Rooma v\u00f5istluskaarikutele.<\/p>\n<p>Terasest ja alumiiniumist kodaratega rattaid hakati valmistama 19. sajandi alguses. Hea vastupidavuse t\u00f5ttu hakati neid kasutama ka jalgrataste, autode ja lennukite valmistamisel.<\/p>\n<p style=\"text-align: center;\"><a href=\"http:\/\/castle.pri.ee\/wp-content\/uploads\/2010\/06\/r_5.jpg\" target=\"_new\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-thumbnail wp-image-4218\" title=\"r_5\" src=\"http:\/\/castle.pri.ee\/wp-content\/uploads\/2010\/06\/r_5-150x150.jpg\" alt=\"\" width=\"150\" height=\"150\" \/><\/a>\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u00a0\u00a0\u00a0\u00a0 Ratas on \u00fcks inimkonna varasemaid tehnilisi leiutisi. Ratast peetakse ajaloos \u00fcheks t\u00e4htsaimaks leiutiseks. Ratta leiutamise t\u00e4pset aega ei teata, kuid ajaloolased oletavad, et inimene kasutas ratast juba tuhandeid aastaid tagasi. Seda hakati kasutama umbes 5000 aastat tagasi. \u00a0 K\u00f5igepealt pandi rattad alla saanikujulistele lohistitele ja nii saadi ratasveok \u2013 vanker. \u00a0 Veonduses kasutatavad ratast [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":3921,"menu_order":11,"comment_status":"open","ping_status":"closed","template":"","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"ngg_post_thumbnail":0,"footnotes":""},"_links":{"self":[{"href":"http:\/\/castle.pri.ee\/index.php?rest_route=\/wp\/v2\/pages\/4175"}],"collection":[{"href":"http:\/\/castle.pri.ee\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"http:\/\/castle.pri.ee\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"http:\/\/castle.pri.ee\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/castle.pri.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4175"}],"version-history":[{"count":24,"href":"http:\/\/castle.pri.ee\/index.php?rest_route=\/wp\/v2\/pages\/4175\/revisions"}],"predecessor-version":[{"id":4322,"href":"http:\/\/castle.pri.ee\/index.php?rest_route=\/wp\/v2\/pages\/4175\/revisions\/4322"}],"up":[{"embeddable":true,"href":"http:\/\/castle.pri.ee\/index.php?rest_route=\/wp\/v2\/pages\/3921"}],"wp:attachment":[{"href":"http:\/\/castle.pri.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4175"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}