The newe attractiue Containyng a short discourse of the magnes or lodestone, and amongest other his vertues, of a newe discouered secret and subtill propertie, concerning the declinyng of the needle, touched therewith under the plaine of the horizon. Now first founde out by Robert Norman hydrographer. Heerevnto are annexed certaine necessarie rules for the art of nauigation by the same R.N.

¶ The maner how to vse the Instrument of Variation. ¶ (Book 2)

The second Chapter. (Book 2)

FIrst you must place the Instrument vp∣pon some Stoole, or other thyng that is flat, so as it may stande leuell, and the Plummet in the Standerd which is pla∣ced at the North ende of the fixed Flye, may fall perpendicularly with the line in the same Standerd.

You must haue regard that in remouing the Instrument to the Sunne as he goeth about, it may alwaies stande leuell as aforesaied.

You are then to consider, that the ••tring that recheth from the South part of the Instrumēt, to the top of the Standerd, is the chiefest string to giue the Sunnes shadow, which must be so directed by turnyng the Instruments South side to the Sunne wards, that the shadowe of the same may fall directly longst vpon the line of South and North in the fixed Flye, for it ought not to crosse or decline from the same line in any part, but if it do, you must seeke to reforme it by setting the Stan∣derd more vpright, or remouyng it at the South end.

Then must you also see, that the string that is fastned to the hoope of Brasse that enuironeth the fixed Flye, maie be so placed, that it agree iustly with the shadow of the former line, and the line of South and North in the fixed Flye, in such sort that both the shadowes maie be as it were hidden in the saied line of the Flye: which you maie doe aptly, by turnyng the said hoope, and remouyng the same line at either side of it, as you shall see cause.

The Instrument beyng duly placed in forme aforesaid, it differeth nothyng from the Cumpas of Uariation, but onely in this poinct, that whereas the Flye of the Cumpas of Ua∣riation, is so turned by vertue of the Magneticall wiers, that

the North poinct thereof doeth shew the Pole of the Magnes or line of Uariation: In this Instrument, the North poinct of the Needle doeth supply that, whiche the North poinct of the Cumpas should doe. And the North poinct of the Flye which is fixed in the bottome of the Instrument, doth alwaies aun∣swere to the shadowe that the Sunne giueth.