Vow OXYGEN COMBUSTION FLASKS and accessories » for microdetermination of halogens, sulfur, phosphorus and other elements in organic compounds VERTICAL LAMP Thomas Infrared Igniter Thomas-Ogg Combustion Flask Thomas Addition Funnel Thomas- Schéniger Flask Thomas-Ogg Infrared Igniter Thomas-Lisk Combustion Flask For many years it was thought that combustion equipment for conversion of organically bound ele- ments to inorganic radicals had to be complicated. Elaborate combustion trains with furnaces, flowmeters, ‘tubes, boats, scrubbers and absorbers—or high pres- sure metal bombs—were used. The equipment was costly, the analysis was slow. Schoniger, using a converted iodine flask with a platinum flag sealed below the stopper, wrapping his sample in a paper packet, and igniting the paper from a burner flame, obtained equally good results. The only accessories he needed were an oxygen. tank and a piece of rubber hose. The flask served as combustion chamber, absorber, and finally as the titration or precipitation vessel ... and there was no undesirable metal contamination. Thomas-Haack Stopper with separable sample holders Thomas was the first to offer the Schdniger flask, and the ‘first to recognize the value of modifications as they were developed by subsequent authors. Modifications include the clamp-closed Ogg flask with ball-and-socket seal, which is somewhat easier to vent following combustion; the Lisk flask, which takes larger samples and incorporates a rubber balloon for safe expansion of gases during combustion; the Haack stopper with its separable sample carriers; and the Addition Funnel for wash-down of radioactive samples. Most significant, because of their safety features when working with samples of unknown character, are the Ogg Infrared Igniters for remotefiring of the sam- ple. The cabinet model is the more convenient, but the clamp-up model can be used in any suitable hood, Copy of detailed Bulletin 6472-B sent upon request. See also Thomas catalog pages 696-699. TET, neers H. THOMAS COMPANY Scientific Apparatus and Reagents