This was a circular metal plate with a graduated margin which carried an inset magnetic needle and an upright central style.
Yayisisazinge sesinyithi sesitya ethe enesidanga kwinto eqikelelayo ukuba kuyimfuneko ethi ilayishwe umfanekiso ofakwe phakathi kwindawo eshicileleyo inomtsalane wenalithi nethe ngqo embindini wesimbo.