LY 
Table .--Conditions during pre-dawn wimowing periods 
~ fotal Period peak Period 
Possible Mine - Min. 
) hrs. before Duration Temperature before Duration Temperature 
Date Nocturnal Location Weather Sunrise minutes range sunrise minutes range 
April 30 9.6 Baiy Bulls Clear moonlight Cont. Cont. 37° =| 32° 95 5 320 
May 11 Fel Tompkins Clear no Moon 88 95 329 - ? hi7 19 9 
May 12 920 R . 87 69 26° - 2? | re ? 
May 13 9.0 t " 85 75 37° = hh 55 5 360 = 1,30 
May 26 8.5 Bay Bulls Overcast 8h 59 36° 70 25 36° 
May 26 8.5 Salmonier tt 85 55 38° = 10° 70 12 38° . 39° 
May 28 8.4, i rt 71 38 43° = 41° 52 F y2° = 42° 
May 30 8.) " " 81 43 38° - 38° B 3 38° 
