Allows a transparent sheet, carrying curves of iso-azimuths, to be adjusted over a chart.
Ivumela intsontelo yokulawula iseyile engenisa ukukhanya, ethwele amagophe okubamba isiqingatha sesazinge esithe tyaba phakathi komqwalaseli osencamini kunye nokujikeleza okukhe nkqo okudlula kwinto eqwalwaselweyo, ize ilungiswe phezu kwemephu yolwandle esetyenziswa ekuqhubeni inqanawa.