天下书楼
会员中心 我的书架

Book II Chapter 28

(快捷键←)[上一章]  [回目录]  [下一章](快捷键→)

a loadstone attracts magneticks not only to a fixed point or pole, but to every part of a terrella save the æquinoctial zone.

c oitions are always more powerful when poles are near poles, since in them by the concordancy of the whole there exists a stronger force; wherefore the one embraces the other more strongly. places declining from the poles have attractive forces, but a little weaker and languid in the ratio of their distance; so that at length on the æquinoctial circle they are utterly enervated and evanescent. neither do even the poles attract as mathematical points; nor do magneticks come into conjunction by their own poles, only on the poles of a loadstone. but coition is made on every part of the periphery, both northern and southern, by virtue emanating from the whole body; magneticks nevertheless incline languidly towards magneticks in the parts bordering on the æquator, but quickly in places nearer the pole. wherefore not the poles, not the parts alone nearest to the pole allure and invite magneticks, but magneticks are disposed and turned round and combine with magneticks in proportion as the parts facing and adjoined unite their forces together, which are always of the same potency in the same parallel, unless they are distributed otherwise from causes of variation.

先看到这(加入书签) | 推荐本书 | 打开书架 | 返回首页 | 返回书页 | 错误报告 | 返回顶部