5 8 MijcellanecL Curiofa. 



TThe Solutions of three Qhorografhic 

 Problems, by a Member of the 

 Philofophical Society of Ox- 

 ford. 



TH E three following Problems may 

 occur at Sea, in finding the diftance 

 and polition of Rocks , Sands ^ &c. from the Sea 

 Shoar \ or in the Surveying of the Sea Coaft ; 

 When only two Obje&s, whofe diftance from 

 each other is known, can be feen at one Sta- 

 tion } but efpecially they may be ufeful to one 

 that would make a Map of a Country by a 

 Series of Triangles derived from one or more 

 meafured Bafes ; which is the moftexadt way 

 of finding the bearing and diftance of Places 

 from each other, and thence their true Lon- 

 gitude and Latitude ; and may confequently 

 occur to one that would in that manner mea- 

 fure a Degree on the Earth. 



The firft Problem (Fig. 3 and 4.) 



There are two Obje&s, B and c, whofe di- 

 ftance B C is known *, and there are two fta- 

 tions at A and £, where the Objects B c 

 being vifible, and the Stations one from 

 another, the Angles B a c, B a £, aE B y 

 uiECj are known by Obfervacion, (which 

 may be made with an ordinary Serveying Se- 

 mklrcle 7 or Croftaf- 7 or if the Objects be 



beyond 



