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SATHI VINTI

SATHI VINTI, sathest, ki khati £ hangomi dar girdi mehvari nojunboni OO’ bo surati kunjii doimi charkh zada va qad-qadi hamin mehvar ba pesh harakat kardanash, tashkil medihad (rasmi 1). Sathi vintie, ki khati rost mekashad, gelikoid (az yunoni eNkoz — spiral va e1<1oz— shakl) nom dorad. Agar in khati rost mehvari OO’-ro tahti. kunji rost burad, on goh golikoidro rost menomand (rasmi 2). Gelikoidi rost sathi minimali meboshad. Har guna Sathi vinti az rui khudash joy ivaz karda metavonad. In khosiyati Sathi vinti dar tekh- nika (masalan, tahvili vinti) istifoda meshavad. Sathi vintiro qat namuda ba sathi charkhzani tabdil dodan mumkin ast. Az jumla gelikoidi rostro qat namuda onro ba katenoid tabdil dodan mumkin ast.

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SAFAR

SAFAR (arabi — tihi, kholi), mohi duyumi solshumorii qamarii hijri, ki az 30 ruz iborat …