154 



CENTRAL SCIENTIFIC CO., CHICAGO, TJ. S. A. 



3029. 

 3030. 

 3032. 



3040. 



3041. 

 3042. 



3044. 



No. 3030. 



No. 3040. 



No. 3032. 



No. 3044. 



3045. 

 3046. 



STAND for Nessler Tubes, of wood stained black, with base covered with milk glass plate. For 

 twelve tall form 50 cc tubes. Without tubes $5.00 



CAMERA for use with color comparison tubes. Improved form, so constructed that the shadow 

 of the edge of the box cannot be thrown on the tubes; with blue and ground glass 12.00 



COLOR TUBE, of brass, 24 inches long, 2% inches in diameter, closed at end by polished plate 

 glass, held in place by a screw cap. Easily cleaned 12.00 



COLORIMETERS 



COLORIMETER, Campbell-Hurley, for use in determining carbon in steel, for water and urine 

 analysis, and in general colorimetric work. The telescope attachment furnishes a circular field 

 divided vertically, rendering comparisons rapid and exact. The color of the standard solution 

 is controlled by raising and lowering a glass plunger in a reservoir attached to one tube. Com- 

 plete as illustrated with standard cylinder graduated to 100 cc in 1 cc divisions, and with cylin- 

 der for unknown graduated to 100 cc in 10 ce divisions. (See Journal of the American 

 Chemical Society, Vol. XXXIV, No. 7, for July 1912) 20.00 



GRADUATED CYLINDER only for No. 3040, for unknown solution 1.25 



GRADUATED CYLINDER only for No. 3040, with attached reservoir and glass plunger, for 

 standard solution 4.00 



COLORIMETER, Duboscq, the standard instrument for the determination of nitrogen, urea, 

 ammonia, creatine, and ereatinine in blood and urine according to the methods of Dr. Otto 

 Folin. Also used for a variety of other determinations in physiological and analytical 

 chemistry. Will yield results accurate to within one per cent. Height of glass cylinders, 

 10 em , '. 120.00 



Accessories for No. 3044. 



GLASS CYLINDER, 10 cm high 3.50 



Glass Plunger, 10 cm high 7.50 



