509 
II. — Prisme asymétrique. 
Nous rapporterons toutes les indications à l’orientation repré¬ 
sentée par la figure 2, et dans laquelle 
(j) i = — 0°31 f et w 2 = — 60°5'. 
1. — Milieu d'indice 1,0003 (air à 20° et 1 atm. 
Si 
s 
e 
- 28o46' 
+ 52°42' 
+ 24°26' 
- 48°3i'30" 
- 28o36' 
+ 540 o' 
+ 22°24' 
- 18o47' 
- 34ol6' 
+ 45°10' 
+ 43«54' 
- 20°23' 
- 36°46' 
-t- 40°56' 
+ 4°40' 
- 23°17' 
- 44°46' 
+ 39o44' 
- 2® 2' 
- 26° 2' 
(minimum) - 46° 4' 
+ 38«47' 
- 7014' 
- 28°29' 
- 48°46' 
+ 38°50' 
- 9°26' 
- 29o35' 
- 53046' 
+ 39o28' 
- 13048' 
- 31o53' 
- 58°I6' 
+ 4(M4' 
- 17o35' 
- 33o58' 
- 63o46' 
+ 42°28' 
- 20°48' 
- 35o48' 
- 68o46' 
+ 44«46' 
- 23o30' 
- 37°22' 
- 73°16' 
+ 47o37' 
- 25°39' 
- 38°39' 
- 78o46' 
+ 50°59' 
- 27047' 
- 39o37' 
- 81046' 
+ 53ol8' 
- 27 e 58' 
- 40° 2' 
)■ 
