Studies on water movements and sediments in Southern Lake Michigan : part 1[-3] ... / by John C. Ayers.

obviously aground from the time of setting. Drogue II (surface drogue) moved off toward the northwest immediately after
setting.
At 1320 drogues III (22 feet) and IV (surface) were set
alongside drogue I. Drogue I was lifted briefly, ten feet of
suspension wire removed, and reset. When set at 33 feet drogue
I did not go aground.
At 1320 drogues I, III, and IV were in a circle of about
50 feet diameter. At recovery on 7 June they were still together in a circle of about 200 feet diameter.
Drogue II, set earlier than the other three, maintained a
separate course throughout the three days. It travelled an
apparent 8.2 miles during its 73.9 hours adrift, giving an indicated speed of 0o11 mph.
Drogues I, III, and IV travelled an apparent 4.3 miles
during their 67.5 hours adrift, giving an indicated speed of
0.06 mph.
The chronology of positions plotted in Figure 2 was:
4 June 0804 #II 41049.61, 87~29.4' (set)
0927 #II 41~49. 8, 87~290 7
1300 #II 41050, 2, 87~30.78
1320 #I, III, IV 41l49.6v, 87~29.49 (set)
1645 #I, III, IV 4o150.0', 87~29.6'
1650 #II 41o50.4', 8703101S
6 June 1400 #I, III, IV 41~52,19, 87~29.48
1432 #II 41054.2 87~29,08
7 June 0850 #I, III, IV 41~5299, 87028.3' (recovery)
0957 #11 41~55.79 87028.80 (recovery)

8