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



369 



Nos. 7508-9. 



Nos. 9462-4. 



NITROGEN DETERMINATION APPARATUS 



9460. KJELDAHL APPARATUS for Nitrogen Determinations, consisting of Condenser No. 9461 of 



polished copper with block tin tubes and Digestion Shelf No. 9462 of sheet iron, with burn- 

 ers provided with individual stop-cocks. Without glass flasks. 



No A B 



Numbers of burners 6 10 



Each $53.50 75.00 



9461. KJELDAHL CONDENSERS only of No. 9460, made of polished copper tin lined, with coils of 



pure block tin tubing. Width at top, 6% inches; depth, 14 inches; height including legs, 



24 inches. 



No A B 



Number of coils 6 10 



Length, inches 24 40 



Each 36.00 50.00 



9462. KJELDAHL DIGESTION SHELVES only of No. 9460, made of sheet iron with iron rod to 



support flasks, mounted on adjustable legs. A special feature of this shelf is the separate 

 stop-cock key provided to prevent burning the fingers when adjusting the flame. Height of 

 apparatus to top of sheet iron shelf, 9% inches; width, 5% inches. 



No A B 



Number of burners .' 6 10 



Length of shelf, inches 24 40 



Each 17.50 25.00 



9464. KJELDAHL DIGESTION SHELVES, same as Xo. 9462, but furnished with burners for gaso- 

 line gas. 



No A B 



Number of burners 6 10 



Each 22.00 32.50 



6268. EXTRA STOP-COCK KEY for Nos: 9462 and 9464 1.00 



KJELDAHL DIGESTION SHELVES, electrically heated, with individual hot plates 3% inches 

 in diameter, each of which has a separate snap switch permitting any one or all to be used 

 at a time. Made of sheet iron with support for flasks. Height to top of shelf, 9 inches; 

 width, 5% inches. 



No A B 



Number of hot plates 6 10 



Length, inches 24 40 



7508. For 110 volts 57.75 90.75 



7509. For 220 volts 57.75 90.75 



