<P_1E>

<heading>

EXPERIMENTS AND NOTES ABOUT THE MECHANICAL ORIGINE OR PRODUCTION OF
ELECTRICITY (BOYLE-E3-P1,1E.3)

</heading>

That $'t $is {TEXT:'tis} not necessary to believe Electrical Attraction
<paren> which you know is generally lifted {COM:sic} among Occult
Qualities </paren> to be the effect of a naked and solitary Quality
flowing immediately from a Substantial Form ; but that it may rather be
the effect of a Material Effluvium , issuing from , and returning to ,
the Electrical Body <paren> and <P_2E> perhaps in some cases assisted
in its Operation by the external air </paren> seems agreable to divers
things that may be observ'd in such Bodies and their manner of acting .
(BOYLE-E3-P1,2E.5)

There are differing <font> Hypotheses </font> <paren> and all of them
Mechanical , propos'd by the Moderns </paren> to solve the Phaenomena
of Electrical Attraction . (BOYLE-E3-P1,2E.6)

Of these Opinions the First is that of the learned Jesuite <font>
Cabaeus </font> , who , though a Peripatetick and Commentator on <font>
Aristotle </font> , thinks the drawing of light Bodies by Jet , Amber ,
&c. may be accounted for , by supposing , that the steams that issue ,
or , if I may so speak , sally , out of Amber , when heated by rubbing
, discuss and expell the neighbouring air ; which after it has been
driven off a little way , makes as it were a small whirl-wind , because
of the resistance it finds from the remoter air , which has not been
wrought on by the Electrical Steams ; and that these , shrinking back
swiftly enough to the Amber , do in their returns bring along <P_3E>
with them such light bodies as they meet with in their way . On
occasion of which <font> Hypothesis </font> I shall offer it to be
consider'd , Whether by the gravity of the Atmospherical Air ,
surmounting the Specifick Gravity of the little and rarifi'd Atmosphere
, made about the Amber by its emissions , and comprising the light Body
fasten'd on by them , the Attraction may not in divers cases be either
caused or promoted . (BOYLE-E3-P1,3E.7)

Another <font> Hypothesis </font> is that proposed by that Ingenious
Gentleman Sir <font> Kenelm Digby </font> , and embraced by the very
Learned Dr. <font> Browne </font> , <paren> who seems to make our
<font> Gilbert </font> himself to have been of it </paren> and divers
other sagacious men . (BOYLE-E3-P1,3E.8)

And according to this <font> Hypothesis </font> , the Amber , or other
Electrick , being chaf'd or heated , is made to emit certain Rayes or
Files of unctuous Steams , which , when they come to be a little cool'd
by the external air , are somewhat condens'd , and having lost of their
former agitation , shrink back to the <P_4E> body whence they sallied
out , and carry with them those light bodies , that their further ends
happen to adhere to , at the time of their Retraction : As when a drop
of Oyl or Syrup hangs from the end of a small stick , if that be
dextrously and cautiously struck , the viscous substance will , by that
impulse , be stretch'd out , and presently retreating , will bring
along with it the dust or other light bodies that chanced to stick to
the remoter parts of it . (BOYLE-E3-P1,4E.9)

And this way of explaining Electrical Attractions is employ'd also by
the Learned <font> Gassendus </font> , who addes to it , that these
Electrical Rays <paren> if they may be so call'd </paren> being emitted
several ways , and consequently crossing one another , get into the
pores of the Straw , or other light body to be attracted , and by means
of their Decussation take the faster hold of it , and have the greater
force to carry it along with them , when they shrink back to the Amber
<P_5E> whence they were emitted . (BOYLE-E3-P1,5E.10)

A third <font> Hypothesis </font> there is , which was devised by the
Acute <font> Cartesius </font> , who dislikes the Explications of
others , chiefly because he thinks them not applicable to Glass , which
he supposes unfit to send forth <font> Effluvia </font> , and which is
yet an Electrical body ; and therefore attempts to account for
Electrical Attractions by the intervention of certain particles ,
shap'd almost like small pieces of Ribbond , which he supposes to be
form'd of this subtile matter harbour'd in the pores or crevises of
Glass . (BOYLE-E3-P1,5E.11)

But this <font> Hypothesis </font> , though ingenious in it self , yet
depending upon the knowledge of divers of his peculiar Principles , I
$can $not {TEXT:cannot} intelligibly propose it in few words ,
(BOYLE-E3-P1,5E.12)

and therefore shall refer you to himself for an account of it : which I
the less scruple to do , because though it be not unworthy of the
wonted Acuteness of the Authour , yet he seems himself to doubt ,
whether <P_6E> it will reach all Electrical Bodies ;
(BOYLE-E3-P1,6E.13)

and it seems to me , that the reason why he rejects the way of
explicating Attraction by the Emission of the finer parts of the
attrahent <paren> to which <font> Hypothesis </font> , if it be rightly
proposed I confess myself very inclinable </paren> is grounded upon a
mistake , which , though a Philosopher may , for want of Experience in
that Particular , without disparagement fall into , is nevertheless a
mistake . (BOYLE-E3-P1,6E.14)

For whereas our excellent Author says , that <font> Electrical Effluvia
</font> , such as are supposed to be emitted by Amber , Wax , &c. $can
$not {TEXT:cannot} be imagin'd to proceed from Glass , I grant the
Supposition to be plausible , (BOYLE-E3-P1,6E.15)

but $can $not {TEXT:cannot} allow it to be true . (BOYLE-E3-P1,6E.16)

For as solid a body as Glass is , yet if you but dextrously rub for two
or three minutes a couple of pieces of Glass against one another , you
will find that Glass is not-4 onely-3 capable of emitting <font>
Effluvia </font> , but such ones as to be odorous , and sometimes to be
rankly stinking . (BOYLE-E3-P1,6E.17)

<P_7E>

But it is not necessary , that in this Paper , where I pretend not-3 to
write Discourses but Notes , I should consider all that has been , or I
think may be , said for and against each of the above-mentioned <font>
Hypotheses </font> ; since they all agree in what is sufficient for my
present purpose , namely , that Electrical Attractions are not the
Effects of a meer Quality , but of a Substantial Emanation from the
attracting Body : (BOYLE-E3-P1,7E.19)

And $'t $is {TEXT:'tis} plain , that they all endeavour to solve the
<font> Phaenomena </font> in a Mechanical way , without recurring to
Substantial Forms , and inexplicable Qualities , or so much as taking
notice of the Hypostatical Principles of the Chymists . Wherefore it
may suffice in this place , that I mention some <font> Phaenomena
</font> that in general make it probable , that Amber , &c. draws such
light Bodies as pieces of Straw , Hair , and the like , by vertue of
some Mechanical Affections either of the attracting or of the attracted
Bodies , or of both the one and the other . (BOYLE-E3-P1,7E.20)

{COM:insert_helsinki_sample_here}

<P_1M>

<heading>

EXPERIMENTS AND NOTES ABOUT THE MECHANICAL PRODUCTION OF MAGNETICAL
QUALITIES . (BOYLE-E3-P1,1M.24)

</heading>

Though the vertues of the <font> Loadstone </font> be none of the least
famous of <font> Occult </font> Qualities , and are perhaps the most
justly admired ; yet I shall venture to offer something to make it
probable , that some , even of these , may be introduced into bodies by
the production of <font> Mechanical </font> changes in them .
(BOYLE-E3-P1,1M.26)

To make way for what I am to deliver to this purpose , it will be
expedient <P_2M> to remove that general and settled prejudice , that
has kept men from so much as thinking of any Mechanical account of
Magnetisms , which is a belief , that these Qualities do immediately
flow from the <font> Substantial Form </font> of the Loadstone , whose
abstruse nature is disproportionate to our understandings .
(BOYLE-E3-P1,2M.27)

<heading>

EXPER. I . (BOYLE-E3-P1,2M.29)

</heading>

But for my part , I confess , I see no necessity of admitting this
supposition ; (BOYLE-E3-P1,2M.31)

for I see , that a piece of Steel fitly shaped and well excited , will
, like a Loadstone , have its determinate Poles , and with them point
at the North and South ; (BOYLE-E3-P1,2M.32)

it will draw other pieces of Iron and Steel to it , and which is more ,
communicate to them the same kind , though not degree , of attractive
and directive vertue it had it self , (BOYLE-E3-P1,2M.33)

and will possess these faculties not as light and transient impressions
, but as such setled and durable Powers that it may retain them for
many years , if the Loadstone , to which it has been duly <P_3M>
applied , were vigorous enough : Of which sort I remember I have seen
one <paren> and made some tryals with it </paren> that yielded an
income to the owner , who received money from Navigators and others for
suffering them to touch their needles , swords , knives &c. at his
excellent Magnet . (BOYLE-E3-P1,3M.34)

Now , in a piece of steel or iron thus excited , $'t $is {TEXT:'tis}
plain , that the Magnetic operations may be regularly performed for
whole years by a body , to which the form of a Loadstone does not
belong , since , as it had its own form before , so it retains the same
still , continuing as malleable , fusible &c. as an ordinary piece of
the same metal unexcited : so that , if there be introduced a fit
disposition into the internal parts of the metal by the action of the
Loadstone , the metal , continuing of the same <font> Species </font>
it was before , will need nothing save the continuance of that acquired
disposition to be capable of performing Magnetical Operations ;
(BOYLE-E3-P1,3M.35)

<heading>

EXPER. II . (BOYLE-E3-P1,3M.37)

</heading>

and if this disposition or internal <P_4M> constitution of the excited
iron be destroyed , though the form of the metal be not at all injured
, yet the former power of Attraction shall be abolished , as appears
when an excited iron is made red hot in the fire , and suffered to cool
again . (BOYLE-E3-P1,4M.39)

<heading>

EXPER. III . (BOYLE-E3-P1,4M.41)

</heading>

And here give me leave to take notice of what I have elsewhere related
to another purpose , namely that a Loadstone may <paren> as I have more
than once tryed </paren> be easily deprived by ignition of its Power of
sensibly attracting Martial bodies , and yet be scarce , if at all ,
visibly changed , but continue a true Loadstone in other capacities ,
which , according to the vulgar Philosophy ought to depend upon its
<font> Substantial Form </font> , (BOYLE-E3-P1,4M.43)

and the Loadstone thus spoiled may , notwithstanding this Form , have
its Poles altered at pleasure like a piece of <P_5M> Iron ; as I have
elsewhere particularly declared . (BOYLE-E3-P1,5M.44)

And I will confirm what I have been saying with an experiment that you
do not perhaps expect ; namely , that though it be generally taken for
granted <paren> without being contradicted that I know of by any man
</paren> that , in a sound Loadstone , that has never been injured by
the fire , not only the attractive Power , but the particular Vertue
that it has to point constantly , when left to it self , with one of
its determinate extreams to one determinate pole , flowes immediately
from the substantial or at least essential Form ; yet this Form
remaining undestroyed by Fire , the Poles may be changed , and that
with ease and speed . (BOYLE-E3-P1,5M.45)

For among my notes about Magnetical Experiments whence I borrow some
passages of this paper , I find the following Account .
(BOYLE-E3-P1,5M.46)

<heading>

EXPER. IV . (BOYLE-E3-P1,5M.48)

</heading>

<P_6M>

To shew that the virtue that a Loadstone hath by this determinate Pole
or Extream to attract , for example , the South-end of a poised needle
, and with the opposite extream or Pole the North-end of the same
needle , I made among other tryals the following Experiment .
(BOYLE-E3-P1,6M.51)

Taking a very small fragment of a Loadstone , I found , agreeably to my
conjecture , that by applying sometimes one Pole , sometimes the other
, to that pole of <paren> a small but </paren> a very vigorous
Loadstone that was fit for my purpose , I could at pleasure , in a few
minutes , change the Poles of the little fragment , as I tryed by its
operations upon a needle freely poised ; though by applying a fragment
a pretty deal bigger , <paren> for in it self it appeared very small ,
</paren> I was not able in far more hours than I employed minutes
before , to make any sensible change of the Poles . (BOYLE-E3-P1,6M.52)

<P_7M>

This short Memorial being added to the preceding part of this discourse
, will , I hope , satisfie you , that how unanimously so ever men have
deduced all magnetick operations from the form of the Loadstone ; yet
some internal change of pores or some other Mechanical alterations or
inward disposition , either of the excited Iron or of the Loadstone it
self , may suffice to make a body capable or uncapable of exercising
some determinate magnetical operations ; which may invite you to cast a
more unprejudiced eye upon those few particulars , (BOYLE-E3-P1,7M.54)

I shall now subjoin to make it probable , that even Magnetical
Qualities may be Mechanically produced or altered . (BOYLE-E3-P1,7M.55)

<heading>

EXPER. V . (BOYLE-E3-P1,7M.57)

</heading>

I have often observed in the shops of Artificers , as Smiths , Turners
of metals &c. that , when hardened and well tempered tools are well
heated by Attrition , if whilest <P_8M> they are thus warmed you apply
them to filings or chips , as they call them , or thin fragments of
Steel or Iron , they will take them up , as if the instruments were
touched with a Loadstone : (BOYLE-E3-P1,8M.59)

but <font> as </font> they will not do so , unless they be thus excited
by rubbing till they be warmed , by which means a greater commotion is
made in the inner parts of the Steel <font> so </font> neither would
they retain so vigorous a Magnetism as to support the little fragments
of Steel that stuck to them after they were grown cold again .
<heading> EXPER. VI . </heading> Which may be confirmed by what , if I
much misremember not , I shewed some Acquaintances of yours ; which was
, that , by barely rubbing a conveniently shaped piece of Steel against
the floor till it had gained a sufficient heat , it would whilest it
continued so , discover a manifest , though but faint attractive power
, which vanished together with the adventitious Heat .
(BOYLE-E3-P1,8M.60)

<heading>

EXPER. VII . (BOYLE-E3-P1,8M.62)

</heading>

<P_9M>

We elsewhere observe , which perhaps you also may have done , that the
Iron bars of windows , by having stood very long in an erected posture
, may at length grow Magnetical , so that , if you apply the North
point of a poised and excited Needle to the bottom of the Bar , it will
drive it away , & attract the Southern ; (BOYLE-E3-P1,9M.65)

and if you raise the magnetic needle to the upper part of the Bar , and
apply it as before this will draw the Northern extream , which the
other end of the bar expelled ; probably because , as $'t $is
{TEXT:'tis} elsewhere declared , the bar is in tract of time , by the
continual action of the Magnetical <font> effluvia </font> of the
Tarraqueous Globe , turned into a kind of Magnet , whose lower end
becomes the North-pole of it , and the other the Southern .
(BOYLE-E3-P1,9M.66)

Therefore according to the Magnetical Laws , the former must expel the
Northern extream <P_10M> of the Needle , and the later {COM:sic} draw
it . (BOYLE-E3-P1,10M.67)

<heading>

EXPER. VIII . (BOYLE-E3-P1,10M.69)

</heading>

I have found indeed , and I question not but other observers may have
done so too , that , if a bar of Iron , that has not stood long in an
erected posture , be but held perpendicular , the forementioned
experiment will succeed , <paren> probably upon such an account as that
I have lately intimated : </paren> (BOYLE-E3-P1,10M.71)

But then this virtue , displayed by the extreams of the bar of Iron ,
will not-1 be at all permanent , but so transient , that , if the bar
be but inverted and held again upright , that end which just before was
the uppermost , and drew the north-end of the needle , will now , being
lowermost , drive it away , which , as was lately observed , will not
happen to a bar which has been some years or other competent time kept
in the same Position . So that , since <P_11M> length of time is
requisite to make the verticity of a bar of iron so durable & constant
, that the same extream will have the same virtues in reference to the
Magnetical needle , whether you make it the upper end or the lower end
of the bar , it seems not improbable to me , that by length of time the
whole Magnetick virtue of this Iron may be increased , and consequently
some degree of attraction acquired . (BOYLE-E3-P1,11M.72)

And by this Consideration I shall endeavour to explicate that strange
thing , that is reported by some Moderns to have happened in <font>
Italy </font> , where a bar of Iron is affirmed to have been converted
into a Loadstone , whereof a piece was kept among other rarities in the
curious <font> Aldrovandus </font> his <font> Museum Metallicum </font>
. (BOYLE-E3-P1,11M.73)

For considering the greatness of its Specific Gravity , the
malleableness and other properties , wherein Iron differs from
Loadstone , I $can $not {TEXT:cannot} easily believe , that , by such a
way as is mentioned , a metal should be turned <P_12M> into a stone .
(BOYLE-E3-P1,12M.74)

And therefore , having consulted the book it self , whence this
Relation was borrowed , I found the story imperfectly enough delivered
: The chiefest and clearest thing in it being , that at the top of the
Church of <font> Arimini </font> a great iron-bar , that was placed
there to support a Cross of an hundred pound weight , was at length
turned into a Loadstone . (BOYLE-E3-P1,12M.75)

But whether the reality of this transmutation was examined , and how it
appeared that the fragment of the Loadstone presented to <font>
Aldrovandus </font> was taken from that bar of Iron , I am not fully
satisfied by that Narrative . (BOYLE-E3-P1,12M.76)

Therefore , when I remember the great resemblance I have sometimes seen
in colour , besides other manifest Qualities , betwixt some Loadstones
and some course or almost rusty Iron , I am tempted to Conjecture ,
that those that observed this Iron-bar when broken to have acquired a
strong Magnetical virtue , which they dreamed not that tract of time
might <P_13M> communicate to it , might easily be perswaded , by this
virtue and the resemblance of colour , that the Iron was turned into
Loadstone : especially they being prepossess'd with that <font>
Aristotelian </font> Maxim , whence our Author would explain this
strange <font> Phaenomenon </font> , that <font> inter Symbolum
habentia facilis est transmutatio </font> . (BOYLE-E3-P1,13M.77)

<heading>

EXPER. IX . (BOYLE-E3-P1,13M.79)

</heading>

But , leaving this as a bare conjecture , we may take notice , that
what virtue an oblong piece of Iron may need a long tract of time to
acquire , by the help onely of its position , may be imparted to it in
a very short time , by the intervention of such a nimble agent , as the
fire . As may be often , though not always , observed in Tongs , and
such like Iron Utensils , that , having been ignited , have been set to
cool , leaning against some wall or other prop , that kept them in an
erected posture , which makes it probable that the great commotion of
the parts , made by the vehement heat of the fire , disposed <P_14M>
the Iron , whilst it was yet soft , and had its pores more lax , and
parts more pliable , disposed it , I say , to receive much quicker
impressions from the Magnetical <font> effluvia </font> of the Earth ,
than it would have done , if it had still been cold .
(BOYLE-E3-P1,14M.81)

<heading>

EXPER. X . (BOYLE-E3-P1,14M.83)

</heading>

And $'t $is {TEXT:'tis} very observable to our present purpose , what
differing effects are produced by the operation of the fire , upon two
Magnetick bodies according to their respective constitutions .
(BOYLE-E3-P1,14M.85)

For , by keeping a Loadstone red-hot , though you cool it afterwards in
a perpendicular posture , you may deprive it of its former power of
manifestly attracting : (BOYLE-E3-P1,14M.86)

But a bar of Iron being ignited , and set to cool perpendicularly ,
does thereby acquire a manifest verticity . Of which differing events I
must not now stay to inquire , whether or no the true reason be , That
the peculiar Texture or internal constitution that makes a Loadstone
somewhat more than an ordinary Ore of Iron , <paren> which metal ,
<P_15M> as far as I have tried , is the usual ingredient of Loadstones
</paren> being spoiled by the violence of the fire , this rude Agent
leaves it in the condition of common Iron , or perhaps of ignited
Iron-ore : whereas the fire does soften the Iron it self <paren> which
is a metal not an Ore </paren> agitating its parts , and making them
the more flexible , and by relaxing its pores , disposes it to be
easily and plentifully pervaded by the Magnetical steams of the Earth ,
from which it may not improbably be thought to receive the verticity it
acquires ; <heading> EXPER. XI . </heading> and this the rather ,
because , as I have often tryed , and elsewhere mentioned , if an
oblong Loadstone , once spoil'd by the fire , be thorowly ignited and
cooled either perpendicularly , or lying horizontally North and South ,
it will , as well as a piece of Iron handled after the same manner , be
made to acquire new poles , or change the old ones , as the skilful
experimenter pleases . (BOYLE-E3-P1,15M.87)

<P_16M>

But whatever be the true cause of the disparity of the fires operation
upon a sound Loadstone and a bar of Iron , the effect seems to
strengthen our conjecture , That Magnetical operations may much depend
upon Mechanical Principles . (BOYLE-E3-P1,16M.89)

And I hope you will find further probability added to it , by some
Phaenomena recited in another paper , to which I once committed some
promiscuous Experiments and Observations Magnetical .
(BOYLE-E3-P1,16M.90)

<heading>

EXPER. XII . (BOYLE-E3-P1,16M.92)

</heading>

If I may be allowed to borrow an Experiment from a little Tract that
yet lyes by me , and has been seen but-2 by two or three friends , it
may be added to the instances already given about the production of
Magnetism . (BOYLE-E3-P1,16M.94)

For in that Experiment I have shewn , how having brought a good piece
of a certain kind of English <font> Oker </font> , which yet perhaps
was no <P_17M> fitter than other , to a convenient shape , though ,
till it was altered by the fire , it discovered no Magnetical Quality ;
yet after it had been kept red-hot in the fire and was suffered to cool
in a convenient posture , it was enabled to exercise Magnetical
operations upon a pois'd Needle . (BOYLE-E3-P1,17M.95)

<heading>

EXPER. XIII . (BOYLE-E3-P1,17M.97)

</heading>

As for the Abolition of the Magnetical vertue in a body endow'd with it
, it may be made without destroying the Substantial or the Essential
Form of the body , and without sensibly adding , diminishing , or
altering any thing in reference to the Salt , Sulphur and Mercury ,
which Chymists presume Iron and Steel , as well as other mixt bodies ,
to be composed of . (BOYLE-E3-P1,17M.99)

For it has been sometimes observed , that the bare continuance of a
Loadstone it self in a contrary position to that , which , when freely
placed , it seems to effect , has either corrupted or sensibly lessened
the vertue of it . (BOYLE-E3-P1,17M.100)

What I formerly observed to this purpose , I elsewhere relate ,
(BOYLE-E3-P1,17M.101)

and since that having a Loadstone , whose vigor was look'd upon by
skilful persons as very extraordinary , and which , whilst it was in an
Artificers hand , was therefore held at a high rate , I was careful ,
being by <P_18M> some occasions call'd out of <font> London </font> ,
to lock it up , with some other rarities , in a Cabinet , whereof I
took the key along with me , and still kept it in my own Pocket .
(BOYLE-E3-P1,18M.102)

But my stay abroad proving much longer than I expected , when , being
returned to <font> London </font> , I had occasion to make use of this
Loadstone for an Experiment , I found it indeed where I left it , but
so exceedingly decayed , as to its attractive power , which I had
formerly examin'd by weight , by having lain almost a year in an
inconvenient posture , that if it had not been for the circumstances
newly related , I should have concluded that some body had purposely
got it out in my absence , and spoiled it by help of the fire , the
vertue being so much impaired , that I cared little to employ it any
more about considerable Experiments . (BOYLE-E3-P1,18M.103)

<heading>

EXPER. XIV . (BOYLE-E3-P1,18M.105)

</heading>

And this corruption of the Magnetical vertue , which may in tract of
time be made in a Loadstone it self , may in a trice be made by the
help of that Stone in an excited Needle . (BOYLE-E3-P1,18M.107)

For $'t $is {TEXT:'tis} observ'd by Magnetical Writers , and my own
Trials purposely made have assured me of it , that a well pois'd Needle
, being by the touch of a good Loadstone , excited and brought to turn
one of its ends to the North and the other <P_19M> to the South , it
may by a contrary touch of the same Loadstone be deprived of the
faculty it had of directing its determinate extreams to determinate
Poles . (BOYLE-E3-P1,19M.108)

Nay , by another touch <paren> or the same , and even without immediate
Contact , if the Magnet be vigorous enough </paren> the Needle may
presently have its direction so changed , that the end , which formerly
pointed to the North pole , shall now regard the South , and the other
end shall instead of the Southern , respect the Northern pole .
(BOYLE-E3-P1,19M.109)

<heading>

EXPER. XV . (BOYLE-E3-P1,19M.111)

</heading>

And to make it the more probable , that the change of the Magnetism
communicated to Iron may be produc'd at least in good part by
Mechanical operations , procuring some change of texture in the Iron ;
I shall subjoyn a notable Experiment of the ingenious Doctor <font>
Power </font> , which when I heard of , I tryed as well as I could ;
(BOYLE-E3-P1,19M.113)

and though , perhaps for want of conveniency , I could not make it
fully answer what it promised , yet the success of the trial was
considerable enough to make it pertinent in this place , and to induce
me to think , it might yet better succeed with him , whose Experiment ,
as far as it concerns my present purpose , imports , that if <P_20M> a
Puncheon , as Smiths call it , or a Rod of Iron , be , by being ignited
and suffered to cool North and South , and hammered at the ends , very
manifestly endow'd with Magnetical vertue , this vertue will in a trice
be destroyed by two or three smart blows of a strong hammer upon the
middle of the oblong piece of Iron . (BOYLE-E3-P1,20M.114)

But <font> Magnetism </font> is so fertile a Subject , that if I had
now the leisure and conveniency to range among Magnetical Writers , I
should scarce doubt of finding , among their many Experiments and
Observations , divers that might be added to those above delivered , as
being easily applicable to my present Argument . (BOYLE-E3-P1,20M.115)

And I hope you will find farther probability added to what has been
said , to shew , <font> that Magnetical operations may much depend upon
Mechanical Principles </font> , by some <font> Phaenomena </font>
recited in another Paper , to which I once committed some promiscuous
Experiments and Observations Magnetical . (BOYLE-E3-P1,20M.116)

Finis . (BOYLE-E3-P1,20M.117)

