Book I chapter 3

Chap. iii.
The Loadstone has parts distinct in their natural power, & poles conspicuous¹ for their property.

T he stone itself manifests many qualities which, though known afore this, yet, not having been well investigated, are to be briefly² indicated in the first place so that students may understand the powers of loadstone and iron, and not be troubled at the outset through ignorance of reasonings and proofs. In the heaven astronomers³ assign a pair of poles for each moving sphere: so also do we find in the terrestrial globe natural poles preeminent⁴ in virtue⁵, being the points that remain constant in their position in respect to the diurnal⁶ rotation⁷, one tending to the Bears and the seven stars; the other to the opposite quarter of the heaven. In like manner the loadstone has its poles, by nature northern and southern, being definite and determined⁸ points set in the stone, the primary boundaries of motions and effects, the limits and governors of the many actions and virtues⁹. However, it must be understood that the strength of the stone does not emanate¹⁰ from a mathematical point, but from the parts themselves, and that while all those parts in the whole belong to the whole, the nearer they are to the poles of the stone the stronger are the forces they acquire and shed into other bodies: these poles are observant of the earth's poles, move toward them, and wait upon them. Magnetick poles can be found in every magnet, in the powerful and mighty¹¹ (which Antiquity¹² used to call the masculine) as well as in the weak, feeble and feminine; whether its figure is due to art or to chance, whether long, flat, square, three-cornered, polished; whether rough, broken, or unpolished; always the loadstone contains and shows its poles. But since the spherical¹³ form, which is also the most perfect, agrees best with the earth, being a globe, and is most suitable for use and experiment, we accordingly wish our principal demonstrations¹⁴ by the stone to be made with a globe-shaped magnet as being more perfect and adapted for the purpose. Take, then, a powerful loadstone, solid, of a just size, uniform, hard, without flaw61; make of it a globe upon the turning tool used for rounding crystals and some other stones, or with other tools as the material and firmness of the stone requires, for sometimes it is difficult to be worked. The stone thus perpared is a true, homogeneous offspring of the earth and of the same shape with it: artificially possessed¹⁵ of the orbicular form which nature granted from the beginning to the common mother earth: and it is a physical corpuscle imbued¹⁶ with many virtues, by means of which many abstruse¹⁷ and neglected truths in philosophy buried in piteous darkness may more readily become known to men. This round stone is called by us a μικρόγη or Terrella62. To find, then, the poles conformable to the earth's, take the round stone in hand, and place upon the stone a needle or wire of iron: the ends of the iron move upon their own centre and suddenly stand still. Mark the stone with ochre or with chalk where the wire lies and sticks: move the middle or centre of the wire to another place, and so on to a third and a fourth, always marking on the stone along the length of the iron where it remains¹⁸ at rest: those lines show the meridian¹⁹ circles, or the circles like meridians²⁰ on the stone, or terrella, all of which meet as will be manifest at the poles of the stone. By the circles thus continued the poles are made out, the Boreal as well as the southern, and in the middle space betwixt these a great circle may be drawn²¹ for an æquator, just as Astronomers describe them in the heavens and on their own globes, or as Geographers²² do on the terrestrial globe: for that line so drawn on this our terrella is of various uses in our demonstrations and experiments magnetical. Poles are also found in a round stone by a versorium, a piece of iron touched with a loadstone, and placed upon a needle or point firmly fixed²³ on a foot so as to turn freely about in the following way:


On the stone A B the versorium is placed in such a way that the versorium may remain in equilibrium²⁴: you will mark with chalk the course of the iron when at rest: Move the instrument to another spot, and again make note of the direction and aspect: do the same thing in several places, and from the concurrence²⁵ of the lines of direction you will find one pole at the point A, the other at B. A versorium placed near the stone also indicates the true pole; when at right angles it eagerly beholds²⁶ the stone and seeks the pole itself directly, and is turned in a straight line through the axis²⁷ to the centre of the stone. For instance, the versorium D faces toward A and F, the pole and centre, whereas E does not exactly respect either the pole A or the centre F64. A bit of rather fine iron wire, of the length of a barley-corn, is placed on the stone, and is moved over the regions and surface of the stone, until it rises to the perpendicular65: for it stands erect²⁸ at the actual pole, whether Boreal or austral; the further from the pole, the more it inclines from the vertical²⁹. The poles thus found you shall mark with a sharp file or gimlet.

1 conspicuous   

adj.明眼的，惹人注目的；炫耀的，摆阔气的

参考例句：

• It is conspicuous that smoking is harmful to health.很明显，抽烟对健康有害。
• Its colouring makes it highly conspicuous.它的色彩使它非常惹人注目。

2 briefly   

adv.简单地，简短地

参考例句：

• I want to touch briefly on another aspect of the problem.我想简单地谈一下这个问题的另一方面。
• He was kidnapped and briefly detained by a terrorist group.他被一个恐怖组织绑架并短暂拘禁。

3 astronomers   

n.天文学者，天文学家( astronomer的名词复数 )

参考例句：

• Astronomers can accurately foretell the date,time,and length of future eclipses. 天文学家能精确地预告未来日食月食的日期、时刻和时长。 来自《简明英汉词典》
• Astronomers used to ask why only Saturn has rings. 天文学家们过去一直感到奇怪，为什么只有土星有光环。 来自《简明英汉词典》

4 preeminent   

adj.卓越的，杰出的

参考例句：

• Washington was recognized as the preeminent spokesman of American Negroes by 1895. 到1895年,华盛顿被公认为美国黑人的卓越代言人。
• He is preeminent because his articles are well written. 他的文章写得很漂亮,卓尔不群。

5 virtue   

n.德行，美德；贞操；优点；功效，效力

参考例句：

• He was considered to be a paragon of virtue.他被认为是品德尽善尽美的典范。
• You need to decorate your mind with virtue.你应该用德行美化心灵。

6 diurnal   

adj.白天的，每日的

参考例句：

• Kangaroos are diurnal animals.袋鼠是日间活动的动物。
• Over water the diurnal change in refraction is likely to be small. 在水面上，折光的周日变化可能是很小的。

7 rotation   

n.旋转；循环，轮流

参考例句：

• Crop rotation helps prevent soil erosion.农作物轮作有助于防止水土流失。
• The workers in this workshop do day and night shifts in weekly rotation.这个车间的工人上白班和上夜班每周轮换一次。

8 determined   

adj.坚定的；有决心的

参考例句：

• I have determined on going to Tibet after graduation.我已决定毕业后去西藏。
• He determined to view the rooms behind the office.他决定查看一下办公室后面的房间。

9 virtues   

美德( virtue的名词复数 )； 德行； 优点； 长处

参考例句：

• Doctors often extol the virtues of eating less fat. 医生常常宣扬少吃脂肪的好处。
• She delivered a homily on the virtues of family life. 她进行了一场家庭生活美德方面的说教。

10 emanate   

v.发自，来自，出自

参考例句：

• Waves emanate from the same atom source.波是由同一原子辐射的。
• These chemicals can emanate certain poisonous gases.这些化学药品会散发出某些有毒的气味。

11 mighty   

adj.强有力的；巨大的

参考例句：

• A mighty force was about to break loose.一股巨大的力量即将迸发而出。
• The mighty iceberg came into view.巨大的冰山出现在眼前。

12 antiquity   

n.古老；高龄；古物，古迹

参考例句：

• The museum contains the remains of Chinese antiquity.博物馆藏有中国古代的遗物。
• There are many legends about the heroes of antiquity.有许多关于古代英雄的传说。

13 spherical   

adj.球形的；球面的

参考例句：

• The Earth is a nearly spherical planet.地球是一个近似球体的行星。
• Many engineers shy away from spherical projection methods.许多工程师对球面投影法有畏难情绪。

14 demonstrations   

证明( demonstration的名词复数 )； 表明； 表达； 游行示威

参考例句：

• Lectures will be interspersed with practical demonstrations. 讲课中将不时插入实际示范。
• The new military government has banned strikes and demonstrations. 新的军人政府禁止罢工和示威活动。

15 possessed   

adj.疯狂的；拥有的，占有的

参考例句：

• He flew out of the room like a man possessed.他像着了魔似地猛然冲出房门。
• He behaved like someone possessed.他行为举止像是魔怔了。

16 imbued   

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）

参考例句：

• Her voice was imbued with an unusual seriousness. 她的声音里充满着一种不寻常的严肃语气。
• These cultivated individuals have been imbued with a sense of social purpose. 这些有教养的人满怀着社会责任感。 来自《简明英汉词典》

17 abstruse   

adj.深奥的，难解的

参考例句：

• Einstein's theory of relativity is very abstruse.爱因斯坦的相对论非常难懂。
• The professor's lectures were so abstruse that students tended to avoid them.该教授的课程太深奥了，学生们纷纷躲避他的课。

18 remains   

n.剩余物，残留物；遗体，遗迹

参考例句：

• He ate the remains of food hungrily.他狼吞虎咽地吃剩余的食物。
• The remains of the meal were fed to the dog.残羹剩饭喂狗了。

19 meridian   

adj.子午线的；全盛期的

参考例句：

• All places on the same meridian have the same longitude.在同一子午线上的地方都有相同的经度。
• He is now at the meridian of his intellectual power.他现在正值智力全盛期。

20 meridians   

n.子午圈( meridian的名词复数 )；子午线；顶点；（权力，成就等的）全盛时期

参考例句：

• Meridians are great circles passing through both poles. 经线均为通过两极。 来自辞典例句
• The Cutaneous Regions are within the domains of the Twelve Regular Meridians. 十二皮部是十二经脉功能活动反映于体表的部位，也是络脉之气散布之所在。 来自互联网

21 drawn   

v.拖，拉，拔出；adj.憔悴的，紧张的

参考例句：

• All the characters in the story are drawn from life.故事中的所有人物都取材于生活。
• Her gaze was drawn irresistibly to the scene outside.她的目光禁不住被外面的风景所吸引。

22 geographers   

地理学家( geographer的名词复数 )

参考例句：

• Geographers study the configuration of the mountains. 地理学家研究山脉的地形轮廓。
• Many geographers now call this landmass Eurasia. 许多地理学家现在把这块陆地叫作欧亚大陆。

23 fixed   

adj.固定的，不变的，准备好的；(计算机)固定的

参考例句：

• Have you two fixed on a date for the wedding yet?你们俩选定婚期了吗？
• Once the aim is fixed,we should not change it arbitrarily.目标一旦确定，我们就不应该随意改变。

24 equilibrium   

n.平衡，均衡，相称，均势，平静

参考例句：

• Change in the world around us disturbs our inner equilibrium.我们周围世界的变化扰乱了我们内心的平静。
• This is best expressed in the form of an equilibrium constant.这最好用平衡常数的形式来表示。

25 concurrence   

n.同意；并发

参考例句：

• There is a concurrence of opinion between them.他们的想法一致。
• The concurrence of their disappearances had to be more than coincidental.他们同时失踪肯定不仅仅是巧合。

26 beholds   

v.看，注视( behold的第三人称单数 )；瞧；看呀；（叙述中用于引出某人意外的出现）哎哟

参考例句：

• He who beholds the gods against their will, shall atone for it by a heavy penalty. 谁违背神的意志看见了神，就要受到重罚以赎罪。 来自辞典例句
• All mankind has gazed on it; Man beholds it from afar. 25?所行的，万人都看见；世人都从远处观看。 来自互联网

27 axis   

n.轴，轴线，中心线；坐标轴，基准线

参考例句：

• The earth's axis is the line between the North and South Poles.地轴是南北极之间的线。
• The axis of a circle is its diameter.圆的轴线是其直径。

28 erect   

n./v.树立，建立，使竖立；adj.直立的，垂直的

参考例句：

• She held her head erect and her back straight.她昂着头，把背挺得笔直。
• Soldiers are trained to stand erect.士兵们训练站得笔直。

29 vertical   

adj.垂直的，顶点的，纵向的；n.垂直物，垂直的位置

参考例句：

• The northern side of the mountain is almost vertical.这座山的北坡几乎是垂直的。
• Vertical air motions are not measured by this system.垂直气流的运动不用这种系统来测量。