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



127 



No. 2382. 



2382. CALORIMETER, Parr Oxygen Bomb, a new instrument of the Berthelot-Mahler type with a 

 bomb made of the new acid-resisting alloy lllium. This metal has proved by means of tests 

 extending over several years to be equivalent to or better than platinum for calorimetric work. 

 This feature renders unnecessary any costly lining of gold or platinum, and consequently makes 

 the Parr outfit the most economical of the bomb calorimeters recognized as standard. The new 

 bomb is also entirely free from the corrosion to which the platinum-lined steel bombs are sub- 

 ject, and eliminates the annoyance due to the chipping and cracking of the enamel in porcelain- 

 lined bombs. A rubber gasket is substituted for the lead of the old type, and a check valve 

 with rubber seat replaces the needle valve. The calorimeter can is oval in shape permitting 

 the use of a rotary stirrer which quickly distributes the heat and obviates any temperature lag. 

 Complete with lllium bomb, water container, insulating vessel of indurated fibre with cover of 

 same, rotary stirrer, pressure gage and needle valve with oxygen connection and couplings, 

 octagon socket for bomb, spanner wrench, six capsules of special alloy, reading lens and sup- 

 port, special ignition wire and gaskets, but without thermometer or motor. (See Report of the 

 Joint Committee of the American Chemical Society and American Society for Testing Ma- 

 terials, in the Journal of Industrial and Engineering Chemistry, Vol. IX, No. 1, for Januarv 

 1917) ". $285.00 



Accessories and Parts for Parr Oxygen Bomb Calorimeter. 



2361. ELECTRIC MOTOR, variable speed, for 110 volts A. C. or D. C 23.00 



2362. ELECTRIC MOTOR, variable speed, for 220 volts A. C. or D. C 23.00 



13533 A. THERMOMETER, 65 to 90 F., in H o divsions, with Bureau of Standards certificate. . . 12.00 

 13533B. THERMOMETER, 65 to 105 F., in H divsions, with Bureau of Standards certificate. . . 15.00 

 13519. THERMOMETER, Beckmann Differential, with range of o to 6 degrees graduated to Moo c - ^th 



Bureau of Standards certificate 32.50 



2384. BOMB only of lllium alloy 210.00 



2385. WATER CONTAINER 10.00 



2386. INSULATING VESSEL, of fiber, with cover, stirrer and pulley 30.00 



2387. PRESSURE GAGE, with needle valve, oxygen connections and couplings 6.50 



2388. OCTAGON SOCKET for bomb " 3.50 



2389. SPANNER WRENCH 6.50 



13730. READING LENS, with support 3 00 



13731. READING LENS only, without support 2 00 



2367. IGNITION WIRE . . '. per card .75 



2390. GASKETS for Valve. per dozen .90 



2391. GASKETS for Union per dozen .25 



2392. CAPSULES, of lllium alloy each 3.50 



