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MIKROMETR

mikrometrMIKROMETR (az mikro… va metr) asbobi andozagirest, ki mekhanizmi tabdildihandai on vintu gayka meboshand. Mikrometrro faqat baroi bo u su­li mutlaqi koptakti chen kardani andozahoi khatti istifoda mebarand. Kori Mikrometr ba joyivazkunii vint qad- qadi mehvar (hangomi dar gaykai nojunbon charkh zanondani on) asos yoftaast. Joyivazkuni ba kunji gardishi vint dar girdi mehvar vobasta ast (rasm). Gardishhoi purrai vintro muvofiqi nishondodi shkalai rui dastai Mikrometr va gardishhoi nopurraro muvofiqi nishondodi shkalai davrii rui ustuvona (baraban) hisob mekunand. Ba sababi dushvorii sokhtani vinthoe, ki detalhoi darozro saheh chen karda metavonand, joyivazkunii optimalii vint dar gayka az 25 mm ziyod nest. Binobar in Mikrometrhoro vobasta ba andozahoi chenshavanda yakchand nav (baroi chen kardani darozihoi az 0 to 25 mm, az 25 to 50 mm va g.) mesozand. Masnuoti chenshavandaro bayni hamvorihoi chenkunandai Mikrometr marham meku­nand. Har yak qadami vint odatan ba 5 6 1 mm barobar ast va muvofiqan qimati taqsimoti shkalai rui dasta ba 0,5 v 1 mm barobar meboshadu shkalai ustuvona 50 b 100 taqsimot dorad (baroi hisob kardani 0,01 mm). Doimiyati quvvai tazyiqi bay­ni detalu vintro olati friksionii makhsus — shaqaka tamin mekunad. Mikrometrho vobasta ba konstruksiya (shakli korpus yo chaspak va sathhoi chenkunanda) yo tainot (chenkunii garsii varaqaho, dandonahoi charkhhoi dandonador) hamvorposhna, fashangdor, varaqsanj, gulbasanj, rakhpechsanj, dandonasanj meshavand. Mikrometrhoro dar namudhoi dasti va ruimizi istehsol mekunand.

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SADUDDINI HAMMUI Muhammad ibni Juvayni

SADUDDINI HAMMUI Muhammad ibni Juvayni (soli tavallud nomalum — Vafot 1252), yake az namoyandagoni mashhuri …