On the night of 27 May a fortunate circumstance arose. While making 

 the first time-series observations of reflected power fluctuations 9 miles 

 south of Cape Race, Newfoundland; the Canadian tanker, SS Imperial 

 Sarnia, appeared as a target among the three icebergs shown in figure 29. 

 When this vessel (295°T; 8,200 yds) approached the same range from the 

 research ship CGC Androscoggin as the iceberg (355°T; 8,200 yds), the 

 echo strength from both targets was measured. The reflected power 

 curve for the iceberg is shown in figure 30. The ratio of the power re- 



Figure 29. — Comparison between the blip intensity of a ship. SS Imperial Sarnia, 

 with that of an iceberg (27 by 84 feet; 1,460 sq. feet) and Cape Race, 

 Newfoundland (vertical cliffs approx. 300 feet) on the 20-mile scale. 

 The ship is at 295 °T; 8 200 yds iceberg at 355°T; 8 200 yds, Cape Race 

 north at 18,000 yds, and other targets are large icebergs. 



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