Book II chapter 17

On the Iron Cap of a Loadstone, with which it is armed at the pole (for the sake of the virtue¹) and on the efficacy of the same.

C onceive a small round plate, concave in shape, of the breadth of a digit² to be applied³ to the convex polar surface of a loadstone and skilfully⁴ attached; or a piece of iron shaped like an acorn⁵, rising from the base into an obtuse⁶ cone⁷, hollowed out a little and fitted to the surface of the stone, to be tied to the loadstone. Let the iron be the best steel, smoothed, shining, and even. A loadstone with such an appliance, which before only bore four ounces of iron, will now raise twelve. But the greatest force of a combining or rather united nature is seen when two loadstones, armed with iron caps, are so joined by their concurrent⁸ (commonly called contrary) ends, that they mutually attract and raise one another. In this way a weight of twenty ounces is raised, when either stone unarmed would only allure¹⁰ four ounces of iron. Iron unites to an armed loadstone more firmly than to a loadstone; and on that account raises greater weights, because the pieces of iron stick more pertinaciously¹¹ to one that is armed. For by the near presence of the magnet they are cemented together, and since the armature173 conceives a magnetick vigour¹² from its presence and the other conjoined piece of iron is at the same time endued¹³ with vigour from the presence of the loadstone, they are firmly bound together. Therefore by the mutual⁹ contact of strong pieces of iron, the cohesion¹⁴ is strong. Which thing is also made clear and is exhibited by means of rods sticking together, Bk. 3, chap 4174; and also when the question of the concretion of iron dust into a united body was discussed. For this reason a piece of iron set near a loadstone draws away any suitable piece of iron from the loadstone, if only it touch the iron; otherwise it does not snatch it away, though in closest proximity¹⁵. For magnetick pieces of iron within the orbe of virtue, or near a loadstone, do not rush together with a greater endeavour175 than the iron and the magnet; but joined they are united more strongly and, as it were, cemented together, though the substance remain the same with the same forces acting¹⁶.

1 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。

2 digit   

n.零到九的阿拉伯数字，手指，脚趾

参考例句：

• Her telephone number differs from mine by one digit.她的电话号码和我的只差一个数字。
• Many animals have five digits.许多动物有5趾。

3 applied   

adj.应用的；v.应用，适用

参考例句：

• She plans to take a course in applied linguistics.她打算学习应用语言学课程。
• This cream is best applied to the face at night.这种乳霜最好晚上擦脸用。

4 skilfully   

adv. (美skillfully)熟练地

参考例句：

• Hall skilfully weaves the historical research into a gripping narrative. 霍尔巧妙地把历史研究揉进了扣人心弦的故事叙述。
• Enthusiasm alone won't do. You've got to work skilfully. 不能光靠傻劲儿，得找窍门。

5 acorn   

n.橡实，橡子

参考例句：

• The oak is implicit in the acorn.橡树孕育于橡子之中。
• The tree grew from a small acorn.橡树从一粒小橡子生长而来。

6 obtuse   

adj.钝的；愚钝的

参考例句：

• You were too obtuse to take the hint.你太迟钝了，没有理解这种暗示。
• "Sometimes it looks more like an obtuse triangle,"Winter said.“有时候它看起来更像一个钝角三角形。”温特说。

7 cone   

n.圆锥体，圆锥形东西，球果

参考例句：

• Saw-dust piled up in a great cone.锯屑堆积如山。
• The police have sectioned off part of the road with traffic cone.警察用锥形路标把部分路面分隔开来。

8 concurrent   

adj.同时发生的，一致的

参考例句：

• You can't attend two concurrent events!你不能同时参加两项活动！
• The twins had concurrent birthday. 双胞胎生日在同一天。

9 mutual   

adj.相互的，彼此的；共同的，共有的

参考例句：

• We must pull together for mutual interest.我们必须为相互的利益而通力合作。
• Mutual interests tied us together.相互的利害关系把我们联系在一起。

10 allure   

n.诱惑力，魅力；vt.诱惑，引诱，吸引

参考例句：

• The window displays allure customers to buy goods.橱窗陈列品吸引顾客购买货物。
• The book has a certain allure for which it is hard to find a reason.这本书有一种难以解释的魅力。

11 pertinaciously   

adv.坚持地；固执地；坚决地；执拗地

参考例句：

• He struggled pertinaciously for the new resolution. 他为了这项新决议而不懈努力。 来自互联网

12 vigour   

（=vigor）n.智力，体力，精力

参考例句：

• She is full of vigour and enthusiasm.她有热情，有朝气。
• At 40,he was in his prime and full of vigour.他40岁时正年富力强。

13 endued   

v.授予，赋予（特性、才能等）( endue的过去式和过去分词 )

参考例句：

• She is endued with wisdom from above. 她有天赋的智慧。 来自《现代英汉综合大词典》
• He is endued with a spirit of public service. 他富有为公众服务的精神。 来自辞典例句

14 cohesion   

n.团结，凝结力

参考例句：

• I had to bring some cohesion into the company.我得使整个公司恢复凝聚力。
• The power of culture is deeply rooted in the vitality,creativity and cohesion of a nation. 文化的力量，深深熔铸在民族的生命力、创造力和凝聚力之中。

15 proximity   

n.接近，邻近

参考例句：

• Marriages in proximity of blood are forbidden by the law.法律规定禁止近亲结婚。
• Their house is in close proximity to ours.他们的房子很接近我们的。

16 acting   

n.演戏，行为，假装；adj.代理的，临时的，演出用的

参考例句：

• Ignore her,she's just acting.别理她，她只是假装的。
• During the seventies,her acting career was in eclipse.在七十年代，她的表演生涯黯然失色。