80 



A. DAIGGER & COMPANY, CHICAGO, U. S. A. 



CALORIMETERS 



2176 



2176 CALORIMETER, Standard Parr's. 



This instrument has been devised by S. W. Parr, professor of Applied Chem- 

 istry at the University of Illinois. The marked features of the method are accu- 

 racy, simplicity, ease and rapidity of manipulation. The results are absolute and 

 not relative. The operations are such as can be carried on by one not especially 

 skilled in laboratory processes. Oxygen under high pressure or any pressure is 

 not used. Sodium peroxide is used as the combustion medium. 



The time consumed in conducting a test on a weighed and dried sample 

 should not exceed fifteen or twenty minutes. With this instrument a determina- 

 tion of the heat units has been made on the various types of fuel selected from 

 widely different sources, including coal, coke, lignite and oils. 



The outfit consists of the apparatus as indicated in cut, including a fine 

 thermometer graduated to 1/20 F. A two-litre measuring flask, chemical recep- 

 tacle, measuring cup, 5-inch 100-mesh brass sieve with bottom, chemicals suffi- 

 cient for fifty determinations, including special chemical for petroleum, etc., 

 pincers, ignition wire, reading lens and camel's-hair brush. 



Latest modification, with improved bomb, complete for electrical ignition, 



without motor $85.00 



The following items are not included in the regular outfit, as they are 

 usually to be found in Chemical Laboratories: 



Electric Motor with variable speed for either direct or alternating current 



110 or 220 volt 25.00 



In ordering state current and voltage required. 



Bank of Resistance for 110 volts 7.00 



Bank of Resistance for 220 volts 8.00 



Water Motor and support 9.00 



