298 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1911. 
Longttudes Ee 4s Antiméridion of Greenwich: . 
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Fic. 1.—Index diagram showing for France the sheet lines of the Air Map. 
Limits of the sheets of the Air Map. 
Limits of the sheets of the World Map. 
37....72 Numbers of the sheets PAU .... BOURGES, ete. 
30, 31,32 Numbers of the sectors of the World Map. 
K, L, M Letters of Zones of the World Map. 
@ Chief towns of Departments. 
Jeoeeeee Itinerary from Bourges to Pau. 
4 28tg 
Fig. 2.—Aeronautical mark. 
Erected on the roof of a building in the environs of Pau, which occupies, in the lower half of sheet 29, 
the relative position represented by the large dot, both on the above frame and on the index diagram (fig.1). 
The coordinates of the SW. corner of the sheet 39 are: 133° south polar distance and 179° new longitude 
E. reckoned from meridian 180° E. or W. of Greenwich (that is, 43° lat. N. and 1° long. W.of Greenwich). 
