July 31, 1885.] 



♦ KNOAVLEDGE ♦ 



Map of H> 



and enlarged in the same watj and iinii 

 mistake of supposing that these inW- 

 correct. Were a different pair of luin 

 at any rate in the lari^-ir atlnsis, 

 northern and asouthern ina]i, Iwn in.i] 

 and its antipodes as cfiiins thr r 

 conveyed -wonld be to somr d.-r. r r. 

 The chief value of tlir ^,nlldi^l m 

 sists, in my opinion, in iis mmimMIh; 

 portions of the gloLe 



111 tlie aerompanying map -we have a hemisphere of 

 tbe earth on the true equidistant construction, — the 

 centre of the map being a point in east longitude 30" 

 and north latitude 38"^. The special object 



, for he 





fn, 



ips of ] 



r,s, at least 



any othor pn.j,.,M „.„ 



as parts of ;iu :il!:i>, are imt iir;irl_\ s. . im |h ,rl aul as maps 

 of continents or of eniuitries. 



I illustrate first, however, the use of the equidistant 

 projection for maps of hemispheres ; as this point 

 naturally comes first under consideration, this being the 

 use for which the construction was originally suggested. 

 I believe, indeed, that until the publication of my " Con- 

 stellation Seasons," my "Library Star Atlas," and my 



the constructio 



the pr> 



of this chart, has been t 



sent, ae 

 ' island 



rd i' 



a.) Tlir 



111;. 



•lU- \V..or 

 the centre of uur map, is betur 

 Atlantic. The student will find i 

 structive exercise to draw such a c 



