A natural philosophy : embracing the most recent discoveries in the various branches of physics, and exhibiting the application of scientific principles in everyday life .. (1899)
Quackenbos, G. P. (George Payn), 1826-1881 · New York, Cincinnati [etc.], American book company · leaf 340
weighing three grains, which would lift750 grains of iron. Their attractive power, however, doesnot increase with their size. Large pieces of loadstonenever support more than five or six times their own weight,and rarely as much. The most powerful natural magnetknown is capable of lifting 310… … Fig. fe R Fig.302. The attractive force thencentres in p and n, which becomethe new poles. This arrangement is called an Armature,and a magnet so prepared is said to be armed. To keep the armature in its place, metallicbands, A B, C D (Fig. 303), are passed round thewhole. A ring, R, is attached to…
Physics
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