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absorption action of light amount Angstrom appear Becquerel blue and violet boiling bright bromide of silver camera Captain Abney carbon carbon printing chloride of silver collimating lens collimator collodion colour sensation compounds considerable dark diffraction diffraction grating dry plates dyes effect emulsion examination exposure eye observations film gelatine give grating haloid salts illuminating iodide of silver lens less refrangible light passing lower refrangibility luminosity luminous maximum medium method mixture negative nitrate of silver obtained orange Orange glass phosphorescent pigments platinotype position Price prism produced pure bromide RAY WOODS rays of low readily rendered retina ruby glass salts of silver sensitive plate sensitometer shown silver bromide silver chloride silver printing slit solar spectrum spec spectra spectroscope spectroscopist stained red substances tablet telescope thicknesses of ruby tints tion transcendant degree transparent trum ultra-violet rays violet rays visible spectrum wave-lengths waves white light yellow
Page 8 - of the wave which first reaches the medium will be the first retarded by it, the other portions, as they enter the glass, being retarded in succession."*
Page 75 - The only special work yet published on the subject of Enamelling. Price 2s.
Page 75 - exposition of those principles of art, the knowledge of which is useful to