2 9° MiJceUanea Curio fa. 



<zd by allowing for the Variation \ but ftill it 

 is an Error, till it be avoided. 



But thirdly, If B\ Surveyor do not allow 

 for the Variation of the Needle, he will ne- 

 ver exa&ly determin even the Points G y F, 

 //, JT, &c. or any other Points in. the Plat ^ 

 but inftead thereof will fall on the Points £, % 



m 



From what has been laid down, we may 

 fee the abfolute neceffity of allowing for the 

 Variation of the Magnet, in comparing old 

 Surveys with new ones *, for want of which 

 great Difputes may arife between neighbour- 

 ing Proprietors of Lands : and it were to be 

 wifti'd that our Honourable and Learned 

 Judges would take this Matter into their 

 Confideration whenever any Bufinefs of this 

 kind comes before them. Hitherto an abfo- 

 lute Acquiefcence in the Down Survey, with- 

 out any of the fore-mention'd Allowance, has 

 been agreed upon as a ftanding Rule in our 

 Courts of Judicature in Ireland \ but that ma- 

 ny Men may be injured thereby, I fuppofe 

 is manifeft from what foregoes. 



I have only this to add, That leaft I be 

 thought herein to ftrike at the Truth or Ex- 

 a&nefs of the Down Survey, 'tis not at ail 

 the intention of this Paper, but rather to 

 confirm it , by fhcwing which way Men 

 ought to Examine it truly, and not by the 

 common ways ufed by them, which rather 

 confound it, and all that claim under it. 



See the Table Fig. 44. 



Al- 



