INTRODUCTION. 



15 



A TABLE ...SHOWING THE NUMBER OF ENGLISH MILES CONTAIN- 

 ED IN A DEGREE OF LONGITUDE, IN EACH PARALLEL OF LA- 

 TITUDE FROM THE EQUATOR. 



[Decrees 





100th 



1 Degrees 





100'h 



I Dt grees 





looth 



1 of 



Miles. 



Parts of 



of 



Miles. 



Parts of 



of 



Miles. 



Parts of 



(Latitude. 





a Mile. 



Latitude 





a Mile. 



Latitude 





a Mile. 



0° 



69 



20 



30 



59 



92 



60 



34 



60 



1 



69 



19 



31 



59 



32 



61 



33 



55 



o 



69 



16 



32 



58 



69 



62 



32 



49 



* 3 



69 



10 



33 



58 



04 



63 



31 



42 



: ; 4 



69 



05 



34 



57 



37 



64 



30 



33 



5 



68 



95 



35 



56 



69 



65 



29 



24 



! 6 



68 



82 



36 



55 



98 



66 



28 



15 



7 



68 



68 



37 



55 



26 



67 



27 



04 



8 



68 



52 



38 



54 



53 



68 



25 



92 



9 



68 



55 



39 



53 



78 



69 



24 



80 



10 



68 



14 



40 



53 



01 



70 



23 



67 



11 



67 



93 



41 



52 



23 



71 



22 



53 



, 12 



67 



69 



42 



51 



42 



I 2 



21 



38 



13 



67 



At 



4o 



43 



50 



61 



73 



20 



23 



14 



67 



14 



44 



49 



78 



. 74 



19 



07 



15 



66 



84 



45 



48' 



93 



75 



17 



91 



16 



66 



52 



46 



48 



07 



76 



16 



-74 



17 



66 



17 



47 



47 



19 



77 



15 



57 



18 



65 



81 



48 



46 



30 



78 



14 



39 



19 



65 



43 



49 



45 



40 



79 



13 



20 



20 



65 



03 



50 



44 



48 



80 



12 



02 



21 



64 



§0 



51 



4 ' 



55 



81 



10 



82 



22 



64 



16 



52 



42 



60 



82 



09 



63 



23 



63 



70 



53 



41 



64 



83 



08 



43 



24 



63 



22 



54 



40 



67 



84 



07 



23 



25 



62 



72 



55 



39 



69 



85 



06 



03 



26 



62 



20 



56 



38 



69 



86 



04 



83 



27 



61 



66 



57 



37 



69 



87 



03 



62 



28 



61 



10 1 



58 



36 



67 



88 



02 



41 



29 



60 



52 | 



59 



35 



64 1 



89 



01 



20 



PROBLEMS PERFORMED BY THE GLOBE. 



Problem 1. To Rectify the Globe. 



The globe being set upon a true plane, raise the pole according 

 to the given latitude ; then fix the quadrant of altitude in the ze- 

 nith ; and if there be any mariner's compass upon the pedestal, let 

 the globe be so situated that the brazen meridian may stand due 

 south and north, according to tkc two extremities of the needle, al- 

 lowing for its variation. 



Prob. 2. To find the Longitude and Latitude of any Place. 



Bring the given place to the brazen meridian, and the degree it 

 is under is the latitude ; then observe the degree of the equator 

 under the same meridian, and you will have the longitude. 



Prob. 3. The Longitude and Latitude of any Place being given, to 

 find that Place on the Globe. 



Bring the degree of longitude to the brazen meridian ; find up- 

 on the same meridian the degree of latitude, whether south or 

 north, and the point exactly under that degree is the place desired. 



