228 SEC. 7. LIGHT. 



912c. Prisms for Camera. M. Lutz, Paris. 



912d. Prisms with Compartments. M. Lutz, Paris. 



912e. Prisms with Compartments. M. Lutz, Paris. 



912f. Bi-refracting Spar Prisms. M. Lutz, Paris. 



912g. Rhomboids of Spar. M. Lutz, Paris. 



912h. Collection of 12 Nicol Prisms. M. Lutz, Paris. 



9121. Four Large Nicol Prisms. M. Lutz, Paris. 



912j. Prisms for M. Desain's Experiments. 



M. Lutz, Paris. 



912k. Uranium Glass Prisms. M. Lutz, Paris. 



9121. Uranium Glass Cube. M. Lutz, Paris. 



912m. Three Quartz Prisms. M. Lutz, Paris. 



91 2n. Prisms for Spectroscope (direct vision). 



M. Lutz, Paris. 

 912o. Prisms for Spectroscope (direct vision). 



M. Lutz, Paris. 

 912p. Two Pyramidal Prisms. M. Lutz, Paris. 



912 q. Three Flagon Prisms. M. Lutz, Paris. 



91 2r. Four Poly prisms. M. Lutz, Paris. 



912s. Four Prisms for Bisulphide of Carbon. 



M. Lutz, Paris. 



912t. Two Isosceles Prisms of Flint Glass. 



M. Lutz, Paris. 



912u. Three Foucault's Prisms. M. Lutz, Paris. 



91 2 v. Two De Senamont's Prisms. M. Lutz, Paris. 



91 2 w. Three Braszinowski and Hartnack's Prisms. 



M. Lutz, Paris. 



912x. Six Hochon's Prisms. M. Lutz, Paris. 



912y. Boit's Prism. M. Lutz, Paris. 



912z. Large Flint Glass Prism, extra denticulated, set in 

 a peculiar manner. M. Lutz, Paris. 



913. Instrument to show the phenomenon of conical re- 

 fraction, with models of FresnePs wave surface. (Soleil, Paris.) 



ff. Lloyd, Trinity College, Dublin. 



