1 84 



MICRl )-ME TAL L ( KiRAPI/Y 



[C//. VI 



will have opportunity to perfect themselves in the preparation, photography 

 and microscopic study of the metals and alloys. 



Beside the sources of information given above, see Dr. H. Ost und Di. 

 Fr. Kolbeck, Lehrbuch derchemischeu Technologiemiteinem Schlussabschnitt 

 " Metallurgie." Hannover, 1901. Behreus, T. H. — Das mikroskopische 

 Gefiige der Metalle, etc. Hamburg, 1894. For an excellent bibliography of 

 188 titles; see the Metallographist, Vol. I, 1898, and appended to the special 

 papers in all the volumes. Also in Iron Age, Jan. 27, 1898. Carpenter-Dal- 

 linger, p. 264; and every number of the Journal of the Royal Microscopical 

 Society and Zeit wiss Mikroskopie. 



'43 144 



Fig. 143. Zeiss' Illuminating Objective. Light at right angles, to the axis 

 of the microscope is reflected by a prism down through the lenses of the objec- 

 tive upon the object. This lights the object, and rays from it pass up through 

 the objective to form the image (Zeiss' Catalog). 



Fig. 144. Leitz' Illuminating Objective. The general principle is the 

 -same as for Fig. T43. (§ ,v.) 



