Book II chapter 19

union with an armed Loadstone is stronger; hence greater weights are raised; but the coition is not stronger176, but generally weaker.



A n armed magnet raises a greater weight, as is manifest¹ to all; but a piece of iron moves towards a stone at an equal, or rather greater, distance when it is bare, without an iron cap. This must be tried with two pieces of iron of the same weight and figure at an equal distance, or with one and the same versorium, the test being made first with an armed, then with an unarmed loadstone, at equal distances.

1 manifest   

n.载货单，运货单，旅客名单；adj.显然的，明白的；vt.显示，证实，出示

参考例句：

• It was their manifest failure to modernize the country's industries.他们使国家进行工业现代化，明显失败了。
• That is manifest to all of us.那对我们大家来说是显而易见的。