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This is one of the earliest magnetometer project articles I've found, yet it is one that is still hard to beat. Unlike the Wadsworth design published in the Feb. 1968 Scientific American, this mag has an automatic mode so you don't have to manually switch the coils. The only improvements that hobbyists have been toying with are toroidal coils and maybe noise improvements in the first gain stage.
This article was published in the October, 1970 issue of Practical Electronics. Practical Electronics merged with Everyday Electronics to become Everyday Practical Electronics, a popular electronics magazine that is owned by UK publisher Wimborne Publishing, Ltd.
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