Word: barographs
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Dates: during 1916-1916
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...feet is attained. Next the candidate takes an 80-horsepower model and flies as far and as high as he wishes. He is now ready for his brevet, for which he must undergo three tests: first, stay an hour at a height of 6500 feet with self-registering barograph; second, make a triangular trip of 130 miles inside of 48 hours; third, make a straight flight 100 miles and back in 24 hours with only one stop allowed each...