. Technical paper. eted burette and B is the Hempel ex-plosion pipette, the sparkgap being shown at (7. Mer-cury was used as the re-taining Uquid in the explo-sion pipette and water inthe burette. The platinumelectrodes, C, were con-nected to the secondarycoil of a 4-inch inductioncoil. The current throughthe primary of the induc-tion coil was furnished by alead storage battery. The volume of gas takenwas the same in all experi-ments—100 c. c. The gasmixture was prepared byintroducing the proper vol-ume of each constituentinto the burette and pass-ing the mixture back andforth between burette
. Technical paper. eted burette and B is the Hempel ex-plosion pipette, the sparkgap being shown at (7. Mer-cury was used as the re-taining Uquid in the explo-sion pipette and water inthe burette. The platinumelectrodes, C, were con-nected to the secondarycoil of a 4-inch inductioncoil. The current throughthe primary of the induc-tion coil was furnished by alead storage battery. The volume of gas takenwas the same in all experi-ments—100 c. c. The gasmixture was prepared byintroducing the proper vol-ume of each constituentinto the burette and pass-ing the mixture back andforth between burette and pipette. The mixture was finally passedinto the pipette and subjected to the action of the electric spark. PREPARATION OF GASES. As a matter of convenience, in part of the work natural gas fromthe Pittsburgh city mains was used instead of methane. Thecomposition of this gas, according to analyses by G. A. Burrell,chemist, is: Composition of natural gas used at Pittsburgh. Methane (CHJ Ethane (CjHg) 16. 0. FiGUEE 1.—Arrangement of gas burette and Hempel explosion pipette. Unsaturated hydrocarbons (C2H4, etc.). Nitrogen (Xj) Oxygen (O2) Hydrogen (H,) Carbon monoxide (CO) Carbon dioxide (CO2) Nitrogen was prepared from aqueous ammonium chloride andsodium nitrite, and was passed through a solution containing fivevolumes of concentrated potassium dichromate to one volume of con-centrated sulphuric acid, in order to remove oxides of nitrogen. EESULTS OF EXPERIMENTS. 9 Carbon dioxide was taken from a tank of liquid carbon dioxide,allowance being made for the air present in the gas, and oxygen wastaken from a tank of compressed oxygen prepared by the Lindemethod. Methane was prepared from sodium acetate and soda-lime, the gasbeing passed through wash bottles containing fuming sulphuric acidand potassium hydroxide. RESULTS OF EXPERIMENTS. Tables 1 and 2 give the results of experiments made in the Hempelexplosion pipette. The results w^ith the natural gas used are con-
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