MtfceUanea Curiofa. a 8 5 



Let AB reprefent the Survey of two 

 Town-Lands, one in the poffeflion of A^ and 

 t'other in the pofleflion of 2?, which we call 

 A Town-Land and B Town-Land, taken by 

 the £W»-Survey , Anno 1657. when there 

 was no Variation. 



Let the Line NS running through the 

 Point P be the true Meridian, and confe- 

 quently the Magnetick Meridian alfo at that 

 time, becaufe of the fuppofed no Variation, 

 and let this Line NS be alfo the Boundary 

 between the two Town- Lands AandB. 



In the year 1695. when the Variation is 

 7 Degrees from the North to the Weftward, 

 B having a Map of the Down Survey, and be- 

 ing fufpicious that his Neighbour A had in- 

 croached on him by a Ditch PO, imploys a 

 Surveyor to inquire into the matter : The 

 Surveyor finds by his Map that the Boundary 

 between B and his Neighbour A run from the 

 Point P through a Meadow directly according 

 to the Magnetick Meridian SP N\ but pb- 

 ferving the Ditch P 6^caft up much to the 

 Ealtward of the prefent Magnetick Meri- 

 dian, he concludes that A has incroached on 

 2?, and that the Ditch ought to have been 

 caft upalongft the Line Pq, the Angle QP q 

 being an Angle of 7 Degrees , that is the 

 prefent Variation of the Needle •, and the 

 Line Pq the prefent Magnetick Meridian: 

 For which Variation , not making any al- 

 lowance, he pofitively determines that B has 

 all the Land in the Triangle Q^P q, more 

 than he ought to have-, and that his Ditch 

 ought to run alongft the Line P q* 



'Tis 



