292 



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



No. 6993. 



No. 6995. 



No. 7004. 



No. 7000. 



No. 7002. 



0993. BURNER, Carpenter's Metropolitan Argand No. 2, specified as the official test burner for coal 

 gas by the Metropolitan Gas Referees of London $25.00 



6995. EDGERTON STANDARD SCREEN, to be mounted on an Argand burner. Used widely in gas 

 works as a standard for candle power in photometric work where frequent approximate tests 

 are to be made. Must be standardized against standard candle 2.25 



F6665. CANDLES, Standard, sperm, six to the pound, will burn 120 grains (7.776 grams) of wax per 

 hour i Each .35 



6997. CANDLE BALANCE, for determining rate per hour at which standard candles burn, complete 



with set of three twenty-grain weights 75.00 



WET PRESSURE GOVERNOR, for delivering gas at uniform pressure see No. 6785. 

 For STOP WATCH, for use in gas testing, see Nos. 12954 to 12962. 



7000. CUBIC FOOT BOTTLE, Immersion Form, used in standardizing meters in gas testing. Deliv- 

 ers exactly one cubic foot of gas by displacement with water. Made of polished brass. With 

 certificate of the United States Bureau of Standards 185.00 



7002. CUBIC FOOT BOTTLE, Cabinet Form, of lacquered copper with nickeled brass fittings. Oper- 

 ates by gravity displacement of gas by water. With certificate of the United States Bureau 

 of Standards 400.00 



7004. CUBIC FOOT BOTTLE, capacity i^o cubic foot, made of polished copper with reservoir of same. 

 Mounted on portable wooden stand with adjustable shelves. With certificate of the United 

 States Bureau of Standards 80.00 



7006. CUBIC FOOT BOTTLE, same as No. 7004, but with a capacity of ^ 2 cubic foot, with certificate 

 of the United States Bureau of Standards 80.00 



