114 



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



No. 2028. 



NO. 2034 



No. 2036. 



2002. BURNERS, Bimsen, Central Draft, an excellent burner for elementary student use. Substances 



accidentally dropped in tube will fall through without clogging gas inlet. Height, 5% inches; 



diameter of tube, % 6 inch ' Each $0.32 



Per dozen 3.20 

 2004. BURNER, Bunsen, Central Draft, same as No. 2002, with air regulator. Height, 5% inches; 



diameter of tube, ~/ w inch. .35 



2006. BURNER, Bunsen, Central Draft, for use with gasoline gas, fitted with air regulator. Height, 



5% inches; diameter of tube, % 6 inch -40 



2008. BURNER, Bunsen, low form, with air regulator. Length, 5% inches; height, 3 inches; diameter 



of tube, % 6 inch 60 



2010. BURNER, Bunsen, micro form, nickel-plated, 2 inches high, tube % inch in diameter 60 



2012. BURNER, Bunsen, micro form, nickel-plated 3 inches high, tube % inch in diameter 35 



2014. BURNER, Argand, adjustable flame, with copper chimney. Especially desirable where uniform 



temperature is essential. Total height including chimney, 7 inches 1.85 



2016. BURNER, Argand, with glass chimney 7 inches high; total height, 10 inches 1.50 



2020. BURNER, Argand, with mica chimney 8 inches high; total height, 11 inches 1.60 



2023. CHIMNEY for Argand Burners, of co"pper. Height, 4 inches; diameter, 2 inches 20 



2820. CHIMNEY for Argand Burners, of glass. Height, 7 inches; diameter, 2 inches. Eacb .12 



Per dozen 1.20 

 2025. CHIMNEY for Argand Burners, of mica. Height, 8 inches; diameter, 2 inches 30 



2028. BURNER, Chaddock's, made of porcelain and white fire clay, incorrodible and extremely dur- 



able. Intended especially for use in hoods, where metal burners corrode. No support or wire 

 gauze necessary. Complete with air regulator, support for dishes, chimney for triangles, 

 asbestos disk and rings. Height including dish support, 9 inches; outside diameter of dish 

 support 4 inches 4.50 



2029. DISH SUPPORT, or Castle Top, for No. 2028 70 



2030. CHIMNEY for triangles, for No. 2028 30 



2034. BURNERS, Koch Safety, with automatic valve to shut off gas when flame is extinguished. Valve 



is operated by spring controlled by expansion and contraction of metallic spirals. Especially 

 desirable in heating incubators or other apparatus where flame must be kept in operation 

 over long periods of time. With threaded inlet for attaching metallic tubing. 



No A B 



Height, inches 5 6 



Diameter of tube, inches %6 Tie 



Each 6.50 7.00 



2036. BURNERS, Koch Safety, same as No. 2034, but on stand adjustable in height. 



No A B 



Height, inches 9 10 



Adjustable to, inches 13 14 



Each 9-20 10.00 



