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



Nos. 6780-8. 



No. 6786. 



6780. GAS CALORIMETER, Sargent's Automatic, for testing the thermal value of inflammable gases. 



Distinctive Features. 



(1) The discharge water is weighed to one-hundredth of a pound instead of being measured 

 in a graduate. 



( 2) The discharge water is switched automatically from one receptable to another after each 

 one-tenth of a cubic foot of gas is burned. This eliminates errors due to hand manipu- 

 lation. 



( 3) Inlet and outlet thermometers are on the same level so that they can be read almost simul- 

 taneously. 



( 4) A wet pressure governor controls the pressure of the gas entering the burner, and a con- 

 stant pressure is easily maintained by means of adjustable weights. 



( 5) To maintain a constant flow the inlet and outlet pipes are provided with weirs. A gradu- 

 ated quadrant valve regulates the amount of water used. 



( 6) Since a determination can be made every three or four minutes, a curve of the heat value 

 extending over any length of time may be plotted. 



( 7) The heat value of the gas is determined directly in B.T.U. 



( 8) The Bunsen burner has two tips and is adjustable for gas having 100 to 1500 B.T.U. per 

 cubic foot. 



( 9) The calorimeter is made of copper and brass and is handsomely nickel-plated. 



(10) The wet test gas meter is made of heavy brass and tin and has a water level indicator 

 outside of the gage glass. The meter is graduated to 0.001 cubic feet. 



Complete as described above, with calorimeter body, wet pressure governor, wet test gas meter, 

 special scales, pair of weighing pails, and two No. 13537A Thermometers 300.00 



Parts and Accessories for No. 6780. 



6781. CALORIMETER BODY, with automatic attachment, Bunsen burner, tubing, exhaust thermo- 



meter and beaker 135.00 



13536A. THERMOMETER, Precision, graduated from 60" to 110F. in one-tenth degree divisions, for 



inlet and outlet temperatures, with calibration curve 18.00 



13537A. THERMOMETER, Precision, same as No. 13536A, but with Bureau of Standards certificate 25.00 

 13540. THERMOMETER, High Grade, graduated from 30 to 150F. in one-tenth degree divisions, for 



inlet and outlet temperatures. Suitable for all ordinary work 8.50 



6785. WET PRESSURE GOVERNOR, with weights 17.00 



6786. WET TEST GAS METER, with all attachments 65.00 



6787. SCALES, Special, weighing to hundredths of a pound. Capacity, 10 pounds 16.50 



6788. WEIGHING PAILS, nickel-plated, accurately balanced per pair 6.00 



6789. SHIPPING CHEST, specially fitted for holding a complete calorimeter outfit in separate com- 



partments 55.00 



6790. TABLES OF STANDARD REDUCTION FACTORS FOR GAS, in book form 1.50 



6791. HEAT VALUE COMPUTER, U. G. 1 3.50 



13730. READING LENS for thermometer 3.00 



6793. MANOMETER, reading to 0.01 inch 18.00 



6794. MANOMETER for differential readings 20.00 



