Henry Oscar Klein

• Collodion Emulsion and Its Applications to Various Photographic and Photo ..
• A glimpse at some Continental schools and studios
• A review of colour photography
• About engraving of half-tone blocks
• About trichromatic portraiture
• Collodion emulsion and colour work
• Collodion emulsion and its applications to various photographic and photo-mechanical purposes, with special reference to trichromatic process work
• Looking backward
• Photography of magnetic fields
• Some notes about three-colour work with collodion emulsion
• The applications of collodion emulsion to three-colour photography, process work, isochromatic photography and spectrographic work
• The importance of correct ratios in colour photography