Robert Hunt - Researches On Light, 1844 by The Patrick Montgomery Collection (via http://flic.kr/p/P86sEG )
Robert Hunt - Researches On Light, 1844 by The Patrick Montgomery Collection (via http://flic.kr/p/P86sEG )
Robert Hunt - Researches On Light, 1844 by The Patrick Montgomery Collection (via http://flic.kr/p/P86sEG )