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Ordinary vegetable oils of the type used for cooking will work but are not ideal. Over time they will gradually oxidise and may be colonised by bacteria, both of which can cause them to become acidic which can itself cause corrosion of the metal. Also vegetable oils can become gummy and sticky in quite a short period of time. Oils help to prevent ...


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According to the Mountaineering Council of Scotland, reversed polarity in compass needles is becoming a significant source of navigation error. The reason is the increasing range of magnetic fields in our transport, clothing and equipment. Polarity Issues: the Symptoms With partial polarity reversal the needle becomes sluggish and skittish. With full ...



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