. Essex naturalist: being the journal of the Essex Field Club. Pkocess ok Magnetizing Ik(.in uv Hammering while it lies in a North-anu-South Position. Fig. ( 11 IK OuSliKVlNG IIIE VaKIAIION 6o ESSEX WORTHIES. regions, being that shown in the accompanying reduced others are depicted in his book. He particularly discussesthe effects of masses of iron ore in mountains and continents inproducing local perturbations or variations of the compass ; a matterwhich has quite lately received fresh attention recently from themagnetic surveys of Professors Riicker and
. Essex naturalist: being the journal of the Essex Field Club. Pkocess ok Magnetizing Ik(.in uv Hammering while it lies in a North-anu-South Position. Fig. ( 11 IK OuSliKVlNG IIIE VaKIAIION 6o ESSEX WORTHIES. regions, being that shown in the accompanying reduced others are depicted in his book. He particularly discussesthe effects of masses of iron ore in mountains and continents inproducing local perturbations or variations of the compass ; a matterwhich has quite lately received fresh attention recently from themagnetic surveys of Professors Riicker and Thorpe, in which theyhave measured the perturbing effects of mountain-chains such as theMalvern Hills, and have even been led to discover the existence ofunderground mountains, one of which, for example, is in the neigh-bourhood of Reading. Book VI. is of a more speculative character,dealing with magnetic motions and cosmical systems : the main pointof interest in it being its frank acceptance of the astronomicaldoctrines of Copernicus. These contributions to purely magnetic knowledge were of greatimportance ; but far transcending them in interest is a
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Keywords: ., bookcentury1800, bookdecade1880, bookidessexnatural, bookyear1887
