2570
JOURNAL OF CHEMICAL EDUCATION
NOVEMBER, 1930
inflammable than the straight nitrocellulose films and also have a greater tensile strength than either the nitrate or acetate films. Threads and films have been made from cellulose formate. This presents excellent possibilities if the brittleness of the resulting thread can be overcome. Another process which is in the experimental stage proposes to produce a cellulose butyrate thread. The LaFrance-Kohorn Company plans to manufacture this type of silk. There are countless problems connected with the present commercial methods for producing rayon which are waiting for research workers to solve. In addition to this we must keep in mind the necessity for an increase in the knowledge of our chief raw material. This information can come only from scientific investigations on cellu~oseitself. Why is it that we are not using wood pulp in the nitrate and acetateprocesses? Why is it necessary to have spruce sulfite wood pulp? Truly this industry presents a wonderful field for the hard-working chemist or chemical engineer. Literature Cited ( I ) GLAZIER, "Historic Textile Fabrics," Scrihner & Son, 597 Fifth Avenue, New York City, 1923. ( 2 ) MULLIN,I d Eng. Chem., 22,466 (1930). (3) "Old Trades and New Knowledge," six lectures delivered before the Royal Institution, Christmas, 1925. ( 4 ) WILLOWS,Chem. & Ind., 45, i 0 3 (1926); BRAGO,aid., 45, 221 (1926); cf. Times ArtificialSilk Supplem~nt, Apr. P,1927. (5) HYDEN,"Manufacture and Properties of Regenerated Cellulose Films." Ind. Eng. Chem.. 21,405 (1929).
UNITED STATES CNIL-SERVICE EXAMINATION FOR METALLURGIST The United States Civil-Service Commission announces an open competitive eaamination for METALLURGIST a t an entrance salary of $3800 a year. Applications for the examination must be on file with the U. S. Civil-Service Commission a t Washington, D. C., not later than October 29, 1930. This examination is to fill vacancies in the Departmental Service, Washington, D. C., and in the Federal classified service throughout the United States. Competitors will not be required to report for examination a t any place, but will he rated on their education, training, experience, and fitness, and on publications, reports, or a thesis. Applicants must show that they have been graduated with a bachelor's degree from an institution of recognized standing, with major work in chemistxy, physics, or metallurgy. Five years of certain additional specified experience or education is also required. Full information may be obtained from the United States Civil-Service Commission, Washington, D. C., or from the Secretary of the United States Civil-Service Board of Examiners a t the post office or customhouse in any city.
