82 Schmidt & Haensch, Berlin S. 



bellows. Either lens can be quickly removed, it being thus possible 

 to work with a single lens, which greatly facilitates many experiments. 



e) Camera with encased Schuckert lamp, with slanting car- 

 bons, to obtain the best illuminating effect; the carbons ma}* also be 

 placed vertically for spectrum analytical experiments. 



II. Projection Apparatus for Zirconium Light. 



The zirconium lamp invented by Prof. Linnemann, which is 

 worked by a coal-gas and oxygen burner, emits a light of about 

 200 caudles and is the best substitute for electrical light in cases 

 where the latter is not available. It is mounted upon large and small 

 stands. (Fig. 19 pag. 81.) 



a) Large camera with large Linnemann burner, with two 

 illuminating lenses of 105 mm diameter, all brass lackered black, with 

 nickel mountings. 



b) Small camera with small Linnemann burner, of tin plate, 

 with two lenses of 105 mm diameter, mounted upon mahogany base. 



Fig. 20. 



If required these apparatus are also supplied with larger lenses and 

 various equipments. (Fig. 20.) 



c) Enlarging camera, with two lenses of 155 mm diameter 

 for photographs not exceeding 9X12 cm: mounted on mahogany board, 

 with movable objective bellows, arrangement for moving the illuminat-, 

 ing lenses, iron casing for the burners. 



d) Mahogany Enlarging Camera, with two illuminating lenses 



