. A critical study of the Ledebur method for determining oxygen in iron and he Ledebur method, ofoxygen in some typical American irons and steels. 4 Leitfaden fur Eisenhiitten Laboratories gth ed., p. 154. 0 Cushman, J., Ind. and Eng. Chem., 3, p. 372. 6 Ibid. McMillen, J., Ind. and Eng. Chem., 5, pp. 123-125. 8 Carnegie Scholarship Memoirs, Iron and Steel Inst., 5, p. 77. 6 Technologic Papers of the Bureau of Standards II. APPARATUS AND REAGENTS 1. HYDROGEN GENERATORS AND PURIFICATION OF HYDROGEN One of the hydrogen generators used for our work is shown inFig. i. It is similar in desi
. A critical study of the Ledebur method for determining oxygen in iron and he Ledebur method, ofoxygen in some typical American irons and steels. 4 Leitfaden fur Eisenhiitten Laboratories gth ed., p. 154. 0 Cushman, J., Ind. and Eng. Chem., 3, p. 372. 6 Ibid. McMillen, J., Ind. and Eng. Chem., 5, pp. 123-125. 8 Carnegie Scholarship Memoirs, Iron and Steel Inst., 5, p. 77. 6 Technologic Papers of the Bureau of Standards II. APPARATUS AND REAGENTS 1. HYDROGEN GENERATORS AND PURIFICATION OF HYDROGEN One of the hydrogen generators used for our work is shown inFig. i. It is similar in design to generators that have for sometime been successfully used in the section of gas chemistry atthis Bureau. To operate the generator, fill the bottle F withzinc (see Fig. i) and replace the stopper, closing the bottle. Fillthe reservoir B with dilute sulphuric-acid mixture i to 6, contain-ing 5 per ioo cc. Open the cocks C and H, whichpermit hydrogen to escape (usually through the train) and applyair pressure to the acid reservoir, B. Acid is thus driven over into. Fig. i.—Hydrogen generator D. When sufficient acid has been forced into D, stopcock C isclosed and the air pressure released. A constant, regulated cur-rent of hydrogen is then obtained by manipulating cock G (H being,of course, open). To stop the generation of gas, close the cocksG and H and open cock C. The pressure of the hydrogen beinggenerated in F forces the acid out of F and D, partially. As soonas the acid is all driven away from the zinc, gas ceases to begenerated. This generator has been found very convenient in use and hasadvantages over others that have been proposed for this kind ofservice. After being filled with reagents and freed from air (bydisplacement or evacuation, or both) spent acid can be replacedwithout any air being introduced into D. F holds enough zinc tosuffice for about 30 determinations. The flow of hydrogen can bewell regulated without much variation of pressure inside
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