Submicron Particles Observed during Etching Process

Abstract

who sponsored the construction of the instrument. In par-(2) SUNDBERG, LUNDBERG and ELKUND. The Mznzng Magazine, tlcular, the author wishes to acknowledge the assistance re-43, pp. 245 and 310 (Oct. and Nov. 1930). ceived from M r J. F. Enslin who carried out the field tests. (3) SUNDBERG and HEDSTROM. Proc. World Petroleum Congress, Acknowledgements are also due to M r C. E. Kain, Mr vol. B, part I, p. 102 (1934). (4) HEDSTROM. Amer. Inst. of Mzn. and Met. Eng. Tech. Publ. no. 827.c. Gingold and Mr Semmelink who carried out the con-( 5 ) WHITEHEAD and RADLEY. 1945 and infinal form 17th M a y 1y4jl ABSTRACT. When a tube containing a gas is rotated about one end a measurable pressure difference, depending upon the length of the tube, the rate of rotation and the density of the gas, is set up between its ends. The instrument utilizes this principle to compare the densities of gases. [MS.first received 12th February