[B & w photos (18) of C.V. Boys's apparatus used in repeating the 'Cavendish experiment' at the Clarendon Laboratory, Oxford. 12 photos are mounted on board, one on card. All but one show the apparatus as set up in the basement of the Clarendon Laboratory] Black and white photos of Boys's apparatus used in repeating the 'Cavendish experiment' at the Clarendon Laboratory circa 1890