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They trapped a mixture of atmospheric air with additional oxygen in a test-tube ( A ) upside-down over a large quantity of dilute alkali solution ( B ) , which in Canvendish 's original experiment was potassium hydroxide , Argon was also encountered in 1882 through independent research of H. F. Newall and W. N. Hartley .
 Canvendish, H. F. Newall, W. N. Hartley
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Canvendish, H. F. Newall, W. N. Hartley