These including surveying, but the magnetised wire placed beneath the compass fly was commonly bent into a rhomboidal shape, or consisted of a pair of straight pieces.
Le yayidibanise novavanyo, kodwa ucingo elinomtsalane elalubekwe ngaphantsi kwekhampasi ebhabhayo yayisaziwa izakugoba sibenamacala amane eliganayo ngambini esingenazimbombo zithe ngqo ukumila okanye sinayo nezimbini ezicala nye amasuntswana.