The secret of the hidden wire beneath it was scarcely known, save to the pilot or master, who carried a lodestone to 'refresh' the instrument from time to time.
Imfihlelo yezincingo ngaphantsi yayinqabile kwaye ingaziwa, yayinceda nakwi nqwelomoya okanye kumphathi, owayesoloko ephethe lamatye aligaqa lentsimbi elikrwada elsisintsalane ukuzama ukuhlaziya izixhobo ngamaxesha.