In what way Verticity exists in any Iron that has been smelted1 though not excited by a lodestone.
H aving thus far211 demonstrated natural and inborn2 causes and powers acquired by means of the stone, we will now examine the causes of magnetick virtues3 in smelted iron that has not been excited by a stone. Loadstone and iron furnish and exhibit to us wonderful subtilities. It has been repeatedly shown above that iron not excited by a stone turns north and south; further that it has verticity, that is, special and peculiar5 polar distinctions, just as a loadstone, or iron which has been rubbed upon a loadstone. This indeed seemed to us at first wonderful and incredible; the metal of iron from the mine is smelted in the furnace; it runs out of the furnace, and hardens into a great mass; this mass is divided in great worksteads, and is drawn6 into iron bars, from which smiths again construct many instruments and necessary pieces of iron-work. Thus the same mass is variously worked up and transformed into very many similitudes. What is it, then, which preserves its verticity, and whence is it derived7? So take this first from the above212 smithy. Let the blacksmith beat out upon his anvil8 a glowing mass of iron of two or three ounces weight into an iron spike9 of the length of a span of nine inches. Let the smith be standing10 with his face to the north, his back to the south, so that the hot iron on being struck has a motion of extension to the north; and let him so complete his work with one or two heatings of the iron (if that be required); let him always, however, whilst he is striking the iron, direct and beat out the same point of it toward the north, and let him lay down that end toward the north. Let him in this way complete two, three, or more pieces of iron, nay11, a hundred or four hundred; it is demonstrable that all those which are thus beaten out toward the north, and so placed whilst they are cooling, turn round on their centres; and floating pieces of iron (being transfixed, of course, through suitable corks) make a motion in the water, the determined14 end being toward the north. In the same way also pieces of iron acquire verticity from their direction whilst they are being beaten out and hammered or drawn out, as iron wires are accustomed to do toward some point of the horizon between east and south or between south and west, or in the opposite direction. Those, however, which are pointed16 or drawn out rather toward the eastern or western point, conceive hardly any verticity or a very undecided one. That verticity is especially acquired by being beaten out. But a somewhat inferior iron ore, in which no magnetick powers are apparent, if put in a fire (its position being observed to be toward the poles of the world or of the earth) and heated for eight or ten hours, then cooled away from the fire, in the same position towards the poles, acquires a verticity in accordance with the position of its heating and cooling. Let a rod of cast iron be heated red-hot in a strong fire, in which it lies meridionally (that is, along the path of a meridian18 circle), and let be removed from the fire and cooled, and let it return to its former temperature, remaining in the same position as before; then from this it will turn out that, if the same ends have been turned to the same poles of the earth, it will acquire verticity, and the end which looked toward the North on water with a cork13 before the heating, if it have been placed during the heating and cooling toward the fourth, now turns round to the south. But if perchance sometimes the rotation19 have been doubtful and somewhat feeble, let it be placed again in the fire, and when it is taken out at a red heat, let it be perfectly20 cooled toward the pole from which we desire the verticity, and the verticity will be acquired. Let the same rod be heated in the contrary position, and let it be placed so at a red heat it is cool; for it is from its position in cooling (by the operation of the verticity of the earth) that verticity is put into the iron, and it turns round to parts contrary to its former verticity. So the end which formerly21 looked toward the north now turns to the south. In accordance with these reasonings and in these ways the boreal pole of the earth gives to the end of a piece of iron turned toward it a southern verticity, and that end is attracted by that pole. And here it must be observed that this happens to iron not only when it is cooled in the plane of the horizon, but also at any angle to it almost up to the perpendicular22 toward the centre of the earth. So the heated iron conceives vigour23 and verticity from the earth more quickly in the course of its return to its normal state, and in its recovery, as it were (in the course of which it is transformed), than by its mere15 position alone. This is effected better and more perfectly in winter and in colder air, when the metal returns more certainly to its natural temperature, than in summer and in warm regions. Let us see also what position alone and a direction toward the poles of the earth can effect by itself without fire and heat. Iron rods which have been placed and fixed12 for a long time, twenty or more years, from south to north (as they not infrequently are fixed in buildings and across windows), those rods, I say, by that long lapse24 of time acquire verticity and turn round, whether hanging in the air, or floating (being placed on cork), to the pole toward which they were pointing, and magnetically attract and repel25 a balanced iron magnetick; for the long continued position of the body toward the poles is of much avail. This fact (although conspicuous26 by manifest experiments) is confirmed by an incident related in an Italian letter213 at the end of a book of Maestro Filippo Costa, of Mantua, Sopra le Compositioni degli Antidoti written in Italian, which translated runs thus: "A druggist of Mantua showed me a piece of iron entirely27 changed into a magnet, drawing another piece of iron in such a way that it could be compared with a loadstone. Now this piece of iron, when it had for a long time held up a brick ornament28 on the top of the tower of the church of St. Augustine at Rimini, had been at length bent29 by the force of the winds, and remained so for a period of ten years. When the monks30 wished to bend it back to its former shape, and had handed it over to a blacksmith, a surgeon named Maestro Giulio Caesare discovered that it was like a magnet and attracted iron." This was caused by the turning of its extremities31 toward the poles for so long a time. And so what has been laid down before about change of verticity should be borne in mind; how in fact the poles of iron spikes32 are altered, when a loadstone is placed against them only with its pole and points toward them, even at a rather long distance. Clearly it is in the same way that that large magnet also (to wit, the earth itself) affects a piece of iron and changes its verticity. For, although the iron may not touch the pole of the earth, nor any magnetick part of the earth, yet verticity is acquired and changed; not because the poles of the earth and the point itself which is 39° distant from our city of London, changes the verticity at a distance of so many miles; but because the whole magnetick earth, that which projects to a considerable height, and to which the iron is near, and that which is situated33 between us and the pole, and the vigour existing within the orbe of its magnetick virtue4 (the nature of the whole conspiring34 thereto), produces the verticity. For the magnetick effluence of the earth rules everywhere within the orbe of its virtue, and transforms bodies; but those things which are more similar to it, and specially17 connected with it by nature, it rules and controls; as loadstone and iron. Wherefore in very many matters of business and actions it is clearly not superstitious35 and idle to observe the positions and conditions of lands, the points of the horizon and the places of the stars. For as when a babe is brought forth36 into the light from its mother's womb, and acquires respiration37 and certain animal activities, then the planets and celestial38 bodies214, according to their position in the universe, and according to that configuration39 which they have with regard to the horizon and the earth, instil40 peculiar and individual qualities into the newly born; so that piece of iron, whilst it is being formed and lengthened41 out, is affected42 by the common cause (to wit, the earth); whilst it is returning also from its heated condition to its former temperature, it is imbued43 with a special verticity in accord with its position. Rather long pieces of iron sometimes have the same verticity at each end; wherefore they have motions which are less certain and well ordered on account of their length and of the aforesaid processes, exactly as when an iron wire four feet long is rubbed at each end upon the same pole of a loadstone.
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1
smelted
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| v.熔炼，提炼（矿石）( smelt的过去式和过去分词 )；合演( costar的过去式和过去分词 )；闻到；嗅出 | |
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2
inborn
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| adj.天生的，生来的，先天的 | |
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3
virtues
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| 美德( virtue的名词复数 )； 德行； 优点； 长处 | |
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4
virtue
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| n.德行，美德；贞操；优点；功效，效力 | |
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5
peculiar
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| adj.古怪的，异常的；特殊的，特有的 | |
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6
drawn
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| v.拖，拉，拔出；adj.憔悴的，紧张的 | |
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7
derived
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| vi.起源；由来；衍生；导出v.得到( derive的过去式和过去分词 )；（从…中）得到获得；源于；（从…中）提取 | |
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8
anvil
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| n.铁钻 | |
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9
spike
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| n.长钉，钉鞋；v.以大钉钉牢，使...失效 | |
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10
standing
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| n.持续，地位；adj.永久的，不动的，直立的，不流动的 | |
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11
nay
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| adv.不；n.反对票，投反对票者 | |
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12
fixed
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| adj.固定的，不变的，准备好的；(计算机)固定的 | |
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13
cork
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| n.软木，软木塞 | |
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14
determined
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| adj.坚定的；有决心的 | |
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15
mere
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| adj.纯粹的；仅仅，只不过 | |
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16
pointed
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| adj.尖的，直截了当的 | |
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17
specially
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| adv.特定地；特殊地；明确地 | |
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18
meridian
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| adj.子午线的；全盛期的 | |
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19
rotation
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| n.旋转；循环，轮流 | |
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20
perfectly
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| adv.完美地，无可非议地，彻底地 | |
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21
formerly
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| adv.从前，以前 | |
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22
perpendicular
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| adj.垂直的，直立的；n.垂直线，垂直的位置 | |
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23
vigour
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| （=vigor）n.智力，体力，精力 | |
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24
lapse
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| n.过失，流逝，失效，抛弃信仰，间隔；vi.堕落，停止，失效，流逝；vt.使失效 | |
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25
repel
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| v.击退，抵制，拒绝，排斥 | |
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26
conspicuous
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| adj.明眼的，惹人注目的；炫耀的，摆阔气的 | |
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27
entirely
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| ad.全部地，完整地；完全地，彻底地 | |
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28
ornament
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| v.装饰，美化；n.装饰，装饰物 | |
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29
bent
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| n.爱好，癖好；adj.弯的；决心的，一心的 | |
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30
monks
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| n.修道士，僧侣( monk的名词复数 ) | |
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31
extremities
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| n.端点( extremity的名词复数 )；尽头；手和足；极窘迫的境地 | |
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32
spikes
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| n.穗( spike的名词复数 )；跑鞋；（防滑）鞋钉；尖状物v.加烈酒于( spike的第三人称单数 )；偷偷地给某人的饮料加入（更多）酒精（ 或药物）；把尖状物钉入；打乱某人的计划 | |
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33
situated
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| adj.坐落在...的，处于某种境地的 | |
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34
conspiring
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| 密谋( conspire的现在分词 )； 搞阴谋； （事件等）巧合； 共同导致 | |
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35
superstitious
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| adj.迷信的 | |
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36
forth
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| adv.向前；向外，往外 | |
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37
respiration
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| n.呼吸作用；一次呼吸；植物光合作用 | |
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38
celestial
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| adj.天体的；天上的 | |
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39
configuration
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| n.结构，布局，形态，(计算机)配置 | |
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40
instil
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| v.逐渐灌输 | |
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41
lengthened
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| （时间或空间）延长，伸长( lengthen的过去式和过去分词 ) | |
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42
affected
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| adj.不自然的，假装的 | |
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43
imbued
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| v.使（某人/某事）充满或激起（感情等）( imbue的过去式和过去分词 )；使充满；灌输；激发（强烈感情或品质等） | |
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