80970
When this information got back to the Royal Society members , Henry Cavendish realised that this may have been due to the gravitational pull of the Allegheny Mountains deflecting the theodolite plumb-bobs and spirit levels .
 Royal Society, Henry Cavendish, Allegheny Mountains
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Royal Society, Henry Cavendish, Allegheny Mountains