So

Appendix.

two Minutes : And therefore will answerall the Purposes of Magnetism in Naviga-tion and experimental Philosophy, muchbetter than the Loadstone, which is wellknown not to have sufficient Power to im-pregnate hard Bars. The half dozen beingput into a Cafe (Fig. 6.) in such a Manner,as that two Poles of the same Denominationmay not be together, and their Irons withthem as one Bar, they will retain the Vir-tue they have received : But if their Powershould, by making Experiments, be everso far impaired, it may be restored with-out any foreign Assistance in few Minutes.And if, out of Curiosity, a much largerSet of Bars should be required, these willcommunicate to them a sufficient Power toproceed with, and they may in a short Time,by the same Method, be brought to theirfull Strength.