Paper, 'Answer to an objection against the cammer [chamber] for compress't air' by D [Denis] Papin Papin responds to critics of his compressed air chamber, who argue that a change in air pressure would be detrimental to the human body. Includes a covering letter from Denis Papin to an unknown recipient, dated 23 December 1708. Subject: Engineering / Biology Read to the Royal Society on 2 February 1709 [1708]