Ratcliffe, Jessica.

Practical cybernetics [article] : Kenneth Craik's scotopic photometer / Jessica Ratcliffe. - 2000.


Craik, Kenneth, 1914-1945.


Photometry--History.--England--Cambridge
Scientific apparatus and instruments--History.--England--Cambridge

Bulletin of the Scientific Instrument Society. - No.65 (Jun.), p.7-9.