A description, in French, of the ventilators installed in Newgate Prison. Written in columns down one side of each page, with marginal notes in different handwriting.

“Description Des Ventilateurs du Dr Hales établis à Londres dans la prison de Newgate ou de la nouvelle porte où ils tirent par le moyen d'un moulin à vent tout le mauvais air des différentes parties de cette prison ces Ventilateurs ont été faits par Mr Stibs, Charpentier, rue Fore près les murs de Londres. “ which translated, reads as “Description of Dr. Hales' Ventilators established in London in Newgate Prison…where they pull by means of a windmill all the bad air from the different parts of this prison these Ventilators were made by Mr. Stibs, Carpenter, Fore Street near the walls of London.”

An accompanying page is a plate from Gentleman’s Magazine, April 1752 and titled “'The Windmill fixed on Newgate to work the Ventilators erected there April 17: 1752”