A treatise of artificial magnets ; in which is shewn an easy and expeditious method of making them, superior to the best natural ones, and also, a way of improving the natural ones, and of changing or converting their poles : Directions are likewise given for making the mariner's needles. In the best form, and for touching them most advantageously, &c / by J. Michell.

  • Michell, John, 1724?-1793.
Date:
1750
Catalogue details

Licence: Public Domain Mark

Credit: A treatise of artificial magnets ; in which is shewn an easy and expeditious method of making them, superior to the best natural ones, and also, a way of improving the natural ones, and of changing or converting their poles : Directions are likewise given for making the mariner's needles. In the best form, and for touching them most advantageously, &c / by J. Michell. Source: Wellcome Collection.

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    applied in the manner of the double 'Touch (here« after defcribed) is another Advantage arifing from their Shape, and a great Advantage indeed it is 5 fince by this means half an Ounce of Ar¬ tificial Magnets may eafily be made to touch a much larger bar, than the beft Natural Mag¬ net in the known world : the Natural Magnets too indeed may be applied after the manner of the double Touch, and with confiderable Ad¬ vantage, but vaftly lefs however than the others; with which it is as practicable to communicate the Magnetic Virtue to a bar of Steel of a Ton weight, as to one of an Ounce, and that with a fmall quantity of them, perhaps two hun¬ dred weight, or lefs; whereas it would be impofiible to do it with lefs than fome thou- fand Tons of Natural Magnets, and thofe not lefs than fome hundred Tons weight each. This may fuffice to convince every impartial Perfon of the great Advantage of Artificial Magnets. It may perhaps be expeCted, that, as Dr. Knight, (who firil brought the Artificial Mag¬ nets to their prefent known perfection,) and perhaps fome others have made Artificial Mag¬ nets, as well as myfelf, fomething fhould be faid of their Method compared with what is here offer’d to the Publick: Whether theirs is the