The new AttraSiue. 

 jSautgafion,tB!)icb 3 [jaae bas long in Ijann, 



The ni?nth Chapter. 



Of the' Variation of tlieNecdlc,from the pole or Axcltrec 

 oftheearth,andhovvitisto be vndcrfio^d. 



n £D ©3,as tbe $eet>le barb e^is apparant 

 ''•" pjopertte in Declining bnoer t^e ^oji« 

 jon,fo uje&tbe poind Rcfpeftiue: &o it 

 tsmott manifeff tbat as in Declining it 

 batb a property in barring, 0} Departing 

 from tbc ^oles * euenas tije poind Re- 

 fpe£tiueopenetb,03 ftjetoetba greater,o? lefTer oiffance be* 

 ttoirf tyt fato poind Refpeaiue, anotbel&ole o? Sreltree 

 oftbe^rtb.anDtbisseparting is talleo Variation of t|je 

 $eebll. SDbis is alfoibetoeo in tbe.$eebleoj liner , in 

 tbat concluuon of Declining in tbe toater , as in Ctjc Uxtz 

 Chapter , enen bg tbe fame pjopotf ion , tbat it fbeta e tb in 

 tbe $ieole ^ojijontallr- 



SDbp Variation is nootber tbtng , f ben a tertainc parte 

 o$ portion of adrt!e 9 ccntaineD bettuiirt ttoo If raigbt lines 

 pjoceebing botb from one Center,U>bicb mas be imagincb 

 to be t|e Center of fbc $eeDle,anb fromf beneebofb ejrten* 

 oingano going oircctl? footfb, oneto tbe pole o; 0r eitrce 

 of tbc toojlo,anu tbe otber totbe poind Refpcaiue,anB tbts 

 part ofrir cie rontaineb totbritf tbefe ttooo lines in t\)t ^o# 

 rif on,is faio to be Variation, 



Sim furrber bcerc is to be not ct>,tbat al&airs t be fe tins 

 Imesbauetiiwrigbtlpncs, cutting t¥^ fircdlp in tbe 

 Center of ibsncetile. SDbceneoftbem crofltngtbe SBiri- 

 manaf rigbt angles in tbe Center of tbe necole,istbe true 

 <£aft ano SSKeC of tbe iDojloe . 0nt> tbe otber trolling tbe 

 line Re fpeftiue at rigbt angles, is tbe falfe Caft ano tuefe 

 tbat tbe barring feeble c : Compaffe fycliictb ; all tolrirb 

 is ujeliiebbBtbispjcfentfigare follotomg. 



%yis 



