CENTRAL SCIENTIFIC CO., CHICAGO, IT. 8. A. 



113 



No. 1990. 



No. 1992. 



No. 1996. 



No. 1998. 



No. 2000. 



1904. BURETTES, Precision or Normal, with Fresenius stop-cock, graduated to meet the requirements 

 of the United States Bureau of Standards. With unofficial factory certificate. 



Capacity, ce 25 50 100 



Graduated in, cc ^ i{ }& 



Each $4.10 4.80 5.20 



1966. BUBETTES. Precision or Normal, with Fresenius stop-cock, tested by the United States Bureau 

 of Standards. With control stamp and certificate of corrections. 



Capacity, ce 25 50 100 



Graduated in, ce Vio Mo % 



Each 7.75 8.25 9.00 



BURETTE ACCESSORIES 



1968. BURETTE ATTACHMENT, consisting of glass tip with rubber connection and pinch-cock .25 



1970. BURETTE ATTACHMENT, three-way, for refilling from reservoir. Complete with glass tip, 



T-tube, rubber connection, and two pinch-cocks 50 



1971. GLASS TIPS only for Nos. 1968-70 per dozen .30 



1976. BUhETTE CAl-S, to protect inside of burettes from dust. 



Xo A B C 



For burettes, ce 25 50 100 



Each : 05 .05 .05 



Per dozen 50 .50 .50 



1982. BURETTE FUNNEL, 1 inch in diameter, for use in filling burettes 30 



19S4. BURETTE MENISCUS READER, consisting of a nickel-plated brass clamp to fasten on the 



burette, with adjustable eyepiece 2.00 



BURNERS FOR GASEOUS FUELS 



Acetylene. 



1990. BURNER, Bunsen, for acetylene gas. Height of burner, 5% inches; diameter of tube, 9fo 

 inch 2.25 



Coal Gas. 



1992. BURNER. Bunsen, with air regulator and slot-shaped nipple which can easily be adjusted to suit 

 the local conditions of gas pressure. Height, 5^ inches; diameter of tube, ^6 inch- Finished 

 in oxidized brass with japanned base .40 



1994. BURNER, Bunsen. similar to No. 1992 but larger in size. Height, o%- inches; diameter of tube, 

 K. inch -50 



1996. BURNER, Bunsen, similar to No. 1992. bnf provided with stop-cock on gas inlet tube. Height, 

 5^2 inches; diameter of tube, ~,\ f , inch 1.25 



1998. BURNER, Bunsen, same as No. 1992, without base, and with stop-cock, for screwing into gas 

 pipe. Convenient for constructing digestion shelves, etc. Total length, 6 inches; diameter, 

 "1,; inch : 1.00 



2000. BURNER. Bunsen, with stop-cock and pilot flame. Height, 6 inches; diameter of tube, H 

 inch 2.30 



