( 6t>7 )

V.T wro Degrees to the Northward of the£»#e,the North Point os the Needle ^£^NeedUdid Incline 8 degrees downward: but as we went to the Southward it was Indi- obftrtfdibyMr. ,n,i abo« 48 D,gr«, Up«a,d.

VL 1 An. J 666. Jun. 13. In Rownbam Meadows near Bristol by the

Water side, Capt. Sturmy took the following Obscrvations. Bristol /i? c«*/r.

Sam. Sturmy n.

O Alt.

Magnetick

Azimutb.

O Azim,

Variation

Westtrly.

44°- *°'

74°

00'

70'.

38'

i°. aa'

39- 3°

80.

00

78.

44

1. 36

31. 50

90.

00

88.

a 6

i- 34

17 X

95-

00

93

36

i. 24

2-3- 10

103.

«o

IOI.

43

i k az

In this Table He notes the greatest Difference to be 14' and taking theMean for the True Variation, he Concludes it then and there, to be just i°.

2.7'. He obferved again in the fame Day of the next Year, m j hm.ir. 1667. and then he found the Variation encrcased about 6'. IVe-sterly.

a. An. 16Z0. I traced z different Meridian Lines in scveral places of Pa- At Pirh; by u.ris , and found, that the Needle Declined 4^ deg. Nortb-Eaß : which having j” 11 a pPublisht, and made known here to the Curious, and to Artists, some of whom *counted 9 or 10 deg. according to the Tradition and Writings of OrontiusWtneus, ayd Castle Franc ? others, 11£ deg. foliowing Senncrtus and Off ustusali at first: Rejected my Obscrvation; and as commonly New things meetwith Obstacles and Contradictions, betöre they are Establisht, thole that couldnot Contradict what they Saw, pretended that this Variety did perhaps pto*ceed from the greateror leflerVigour in the Loadstones employed to touch with,or from thence, that the Needles had been Toucht nearer to or farther fromtheir Toles.

To remove the Objections and to try another Quality which Gilben had af-signed to Tenella*s, I causcd a Magnet to be Turned with the Powder of E-mery till it became Spherical r Incb in Diameter, its 3 Centers of MagnitudeGravity and Hlrengtb being the fame wich so much Justnels, that aster I hadexachly found the rwo Poles of this Stone, I causcd 2. Small Holes to be madetherein, to ftpport it by two points of Needks, as by two Pivots: whichhaving put in a Meridian of Brals, and Sufpended the Ball betwixt them like

a