. Essex naturalist: being the journal of the Essex Field Club. J>-»=> GiLDEKts SlHERICAL LOADSTONE, OR The Terrella and its surrounding fieldof action. and the meridians are marked out upon a geographical chart o^terrestrial globe. The fact that a magnet of elongated shape—amagnetic rod—is more powerful than one of spherical or cubical orany other shape of equal weight (the horseshoe shape not being dis-covered until many years later) is announced. The screening effectof a sheet of thin iron, and the failure of other metals to screen offmagnetic action, are noted. Then comes a
. Essex naturalist: being the journal of the Essex Field Club. J>-»=> GiLDEKts SlHERICAL LOADSTONE, OR The Terrella and its surrounding fieldof action. and the meridians are marked out upon a geographical chart o^terrestrial globe. The fact that a magnet of elongated shape—amagnetic rod—is more powerful than one of spherical or cubical orany other shape of equal weight (the horseshoe shape not being dis-covered until many years later) is announced. The screening effectof a sheet of thin iron, and the failure of other metals to screen offmagnetic action, are noted. Then comes a series of studies on theeffect of capping loadstones with armatures of iron, and on thestrengthening of the power of loadstones. Chapter xxxii. of Book a notable one, containing a number of magnetic aphorisms, eachtersely summing up some result of experiment or observation. In it theprincipleofequalityofactionandreactionisillustrated by the experimentof floating a magnet in a little skiff and showing that it attracts itself toa piece of iron, just as the iron, if placed in the skiff, will be attractedto
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