1 To finde out the Poles in the Magneticall Terrella.
To performe this conclusion many artificiall wayes haue been inuented, 1 By the Inclinatory Needle: for being euenly hung in such sort vpon the Terrella, as may be seene in the former figure
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1 To finde out the Poles in the Magneticall Terrella.
To performe this conclusion many artificiall wayes haue been inuented, 1 By the Inclinatory Needle: for being euenly hung in such sort vpon the Terrella, as may be seene in the former figure
it will according to diuers points diuersly respect the Terrella in his site: wheresoeuer then wee shall finde it to fall perpendi∣cularly as right angles, wee may assure our selues that that very point is the Pole: which being once knowne, it will be easie to finde the opposite Pole, either the same way, or by measuring. 2 By the Veyne or Mine of the Loadstone: for (as wee haue shewed in our fourth Chapter of this Treatise) that part which was situated towards the North, will afterwards direct it selfe Southward, and contrariwise, the South point will respect the North, whence the Poles may be discouered. 3 By a little boat, wherein the Loadstone being placed on the water, will moue round till such time as with one Pole hee may point out the North, with the other the South. Many other wayes may be in∣uented by Mechanicians, perhaps more curious, to whose indu∣stry I referre my ingenious Reader.