Phil Mag. S.5.V0I.5.H.XI. 



Sir &. Ahy's Correctiorv of they Compass 



iru Irorv STrips, without use/ of cu fvooexb mxirh. 



H 





\ oj^- 081 °er 







\ ojfe^^^ - 



~~^^>i 





\jk?^ 



^^^%- 



#\ 



^N& 



3y \ m. 

 ffl \ \ 







_J^f '■ \\ 



Jl \ \p__ 



— " ( Grcuhxxjd&cL V0& 



7/ "^—^^^^A 



GLrcl& \\ 



°/-/ -■ /\ \\ 



/ engrccvecb VlS 



of 



!S 

 O 





/ ^ on paper) \ 



\ ~~ - 







-It" 



°u / / 



\ be jjjo 



°\\ / 



// 



^\ // / 



Jr 



^\ y / 





^5/ / 



y^ 



o/ ^^4 



^& 





/^^^ir---— i 



—^^£ 







A 30 c 



f^ — 550 





^ / 



(MebaXbLc T'Scpuuxra .) 



, , , , , , , \ 



i — 1 — 1 1 — 1 1 1 1 1 1 — 1 — 1 — -j — 1 — 1 



70 60 50 40 30 20 10 10 20 30 40 50 60 70 



Mintern Bros lith. 



