British Airships, Past, Present and Future

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Author: George Whale
Language: English
Wordcount: 40,917 / 125 pg
Flesch-Kincaid Reading Ease: 57.5
LoC Categories: UG, TL
Downloads: 602
mnybks.net#: 7367
Origin: gutenberg.org
Genre: Non-fiction
Excerpt

part for every degree Fahrenheit rise or fall in temperature. In the case of the 1,000 cubic feet balloon, the air at 30 inches barometric pressure and 60 degrees Fahrenheit weighs 75 lb., and the hydrogen weighs 5 lb. At the same pressure, but with the temperature increased to 90 degrees Fahrenheit, the air will be expanded and 1,000 cubic feet of air will weigh only 70.9 lb., while 1,000 cubic feet of hydrogen will weigh 4.7 lb. The lift being the difference between the weight of the volume of air and the weight of the hydrogen contained in the balloon, it will be seen that with the temperature at 60 degrees Fahrenheit the lift is 75 lb. - 5 lb. = 70 lb., while the temperature, having risen to 90 degrees, the lift now becomes 70.9 lb. - 4.7 lb. = 66.2 lb. Conversely, with a fall in the temperature the lift is increased. We accordingly find from the foregoing observations that at the start of a voyage the lift of an airship may be expected to be greater when the temperature is co

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