Makers of ElectricityWalsh, James J. (James Joseph)
History
Makers of Electricity
Walsh, James J. (James Joseph)
Electricity -- Biography
Norman made another remark of great importance in the new philosophy,
the justness of which was appreciated by Gilbert, his contemporary, but
more so by Faraday and Clerk Maxwell, two centuries later. It refers to
the space surrounding a magnet, natural or artificial, which cubical
space Gilbert, following Norman, called an _orb of virtue_. That the
influence or "effluvium" of the magnet extends throughout the entire
space may readily be seen by carrying a compass-needle round a magnet
from point to point, far away as well as close by. The phrase "orb of
virtue," or sphere of magnetic influence, appears to describe the actual
magnetic condition of the space in question more pertinently than our
modern equivalent of "magnetic field."
The words of Norman are very remarkable: "I am of opinion that if this
vertue could by anie means be made visible to the eie of man, it would
be found in a sphericall forme, extending round about the stone in great
compasse and the dead bodie of the stone in the middle thereof." The
lines which immediately follow this statement, pregnant with
significance, show the deep religious feeling of the author. They read:
"and this I have partly proved and made visible to be seene in some
manner, and God sparing mee life, I will herein make further experience
and that not curiouslie but in the feare of God as neere as He shall
give me grace and meane to annexe the same unto a booke of navigation
which I have had long in hand."--Chap. VIII.
It is evident from the pages of the _Newe Attractive_ (1581) that Norman
was animated with the right spirit of inquiry, which is calm, deliberate
and judicious, which leads to the discovery of facts, to their
coordination and experimental illustration before explanations are
thought of and long before new theories are propounded. The style in
which this little treatise is written has a charm of its own, mainly by
reason of its quaintness. At the end of his address to the candid
reader, which, after the manner of the times, was somewhat belabored and
rhetorical in character, Norman breaks away from common inadequate
prose; and, giving wings to his imagination, writes a lyric on the
magnet which is the first metrical composition in English that we have
on such a subject. It reads:--
THE MAGNES OR LOADSTONE'S CHALLENGE.
Give place ye glittering sparks,
ye glimmering Diamonds bright,
Ye Rubies red, and Saphires brave
wherein ye most delight.
In breefe, yee stones inricht,
and burnisht all with golde,
Set forth in Lapidaries shops,
for Jewells to be sold.
Give place, give place I say,
your beautie, gleame and glee,
Is all the vertue for the which,
accepted so you bee.
Magnes, the Loadstone I,
your painted sheath defie,
Without my help in Indian seas,
the best of you might lie.
Public-domain text, read in full here on John Shaqi.
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