PLATE - V ' l 
XXXIII. 
HEIGHTS IN FEET 
FEET .METRES 
1500 
1250 
1000 
900 
700 
600 
500 
400 
300 
200 
457-2 
381 - I 
304-8 
274-3 
243 8 
213-4 
182-9 
152-4 
121-9 
91-4 
61 
DEPTHS IN FEET 
feet!IA^Mmetres 
3-05 
7-6 
15-2 
