158 



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



No. 3082. 



No. 3088. 



No. 3089. 



3082. COLORIMETER, Kober Nephelometer, for use in accurate colorimetric and nephelometrie deter- 



minations in chemical and biological work, with any depth of liquid up to 110 mm. The opti- 

 cal parts are arranged to give a Lummer-Brodhun field, with the light from one side forming 

 a square area enclosed by the circular area of light from the other side. The plungers are 

 made of opaque black tubing with glass ends fused on, as are also the glass cups for colori- 

 metrie uses. The cups for nephelometrie uses are made of clear glass tubing with black 

 opaque glass bottoms fused on. The cups are raised and lowered by a screw with a double 

 milled head, which gives the effect of a double adjustment. An accurately divided scale is 

 provided, and the verniers are adjustable enabling the instrument to be set quickly at zero. 

 The framework can be tilted like a microscope and securely clamped in any position. The 

 source of light for nephelometrie work is a concentrated filament lamp in front of which is 

 mounted a condensing lens to bend the rays of light parallel. The reflecting mirrors are in 

 pairs so that any inequalities in the light falling on the two sides of the instrument may bo 

 corrected. The entire instrument is enclosed in a metal housing which effectually cuts out 

 any stray light and protects the parts from dust. Complete with 2 long and 2 short Colori- 

 metric Cups No. 3090, 2 long and 2 short Nephelometrie Cups No. 3091, Lamp-house with 110 

 volt lamp, cord and plug, mounted on a black polished board with switch; with directions for 

 use. (See the Journal of Biological Chemistry, Vol. XXIX, No. 2, for March 1917, page 155) 

 , $105.00 



Parts and Accessories for No. 3082. 



3083. Lamp-House only, without lamp 27.50 



3084.- Concentrated Filament Lamp for 110 volts 2.00 



3085. Zero Gage 30 



3086. Plungers, of black glass with clear fused bottoms per pair 4.00 



3087. Colorimetric Cups, of black tubing with blue bottoms, for use with artificial light. 



No A B 



Style long short 



Per pair 4.50 4.50 



3088. Colorimetric Cups, of black tubing with white bottoms, for use with daylight. 



No '. . . . A B 



Style long short 



Per pair 4.00 4.00 



3089. Colorimetric Cups, of white tubing with blue bottoms, for use with artificial light. These are 



adapted for uses requiring that the liquid be kept under observation by the operator. 



No A B 



Style long short 



Per pair 3.50 3.50 



3090. Colorimetric Cups, of white tubing with white bottoms, for use with daylight. 



No '. . . . A B 



Style long short 



Per pair 3.00 3.00 



3091. Nephelometrie Cups, of white tubing with black bottoms. 



No A B 



Style long short 



Per pair 4.00 4.00 



3092. Portable Dark Room for use with No. 3082 . . 35.00 



