TEGNIES GESPOKE: LEER ’N NUWE KNOOP

`n Wetenskaprubriek deur Neil Janse van Rensburg.

Toue is een van die oudste uitvindsels wat ’n dramatiese impak op die mensdom gehad het. Dink aan die toue wat gebruik word in ’n Egiptiese shaduf waarmee water uit ’n put of rivier gelig word, of die toue op Jan van Riebeeck se seilskepe wat die seile posisioneer en vasbind. Sonder toue sou die wêreld anders gelyk het. Moderne toue kan van allerlei eksotiese materiale soos kevlar vervaardig word om byvoorbeeld teen hoë temperature te werk. ’n Tou moet as ’n waardevolle gereedskapstuk beskou en gerespekteer word.

Knope is natuurlik die manier waarop ’n tou aan items of ander toue gebind word. Daar is oor die eeue heen duisende knope ontwikkel, elk met spesifieke doel en sekere voor- en nadele. Daar is selfs ’n internasionale knoopgulde vir knoopentoesiaste.

’n Knoop se eienskappe word deur tegniese gebruikers teen drie hoof kriteria gemeet. Eerstens, die persentasie waarmee die knoop die tou verswak (’n knoop vorm inherent ’n swakplek in die tou); tweedens, die gerief waarmee ’n knoop losgemaak kan word nadat dit onder spanning was; derdens, die geneigdheid van ’n knoop om self los te kom as dit nie onder spanning is nie.

Van die honderde keuses is die figuur-8-knoop baie nuttig: baie sterk, redelik maklik om los te maak ná spanning gedra is en kom nie maklik self los nie. Dit vorm ’n lus op die punt van ’n tou en word tipies gebruik om ’n bergklimmer se harnas aan die hooftou te bevestig.

Ek moedig almal aan om ’n paar nuttige knope goed te ken, eerder as om ’n magdom knope sleg te ken – ’n goeie knoop vergemaklik talle dag-tot-dag-take, van wasgoedlyne span, kampeertente opslaan, bakkievragte vasmaak tot lewens red.

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