2&# S.CIEN^TIFIC NEWS* 



Applicative Campafs for taking Bearing on a Chart, by N. J), 

 .twit i otakck, Efip of the Royal Navy. 



Corapafsfor Tills Inftrumenl, (ten in Figi'M, Plate XL cbnfiits of an 



tak,ng , be * nngs * inner and'outer bra fs concentric circle; the latter of which, 



on a chart. . ' ' 



when in ule', is to be applied to a chart, fo that its cardinal 



points may agree with thofe of the draft, and its central (me- 

 tallic) point be directly over the (hip's place. The inner circle 

 is to be fet to the variation ; and the thread from the center 

 being laic], wrll (hew either bearings by compafs, or true 

 bearing?, according to the circle upon which they are read. It 

 is obvious alfo, that the infirument may be ufed in delineating^ 

 plotting, and for various other ufeful purpofes. 



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