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Published January 1, 1947 | public
Journal Article Open

An Investigation of a Method for the Analysis of Smokes According to Particle Size


An electrical precipitation method for the analysis of smokes according to particle size has been investigated. A thin stream of smoke particles moving under laminar conditions in a wind tunnel of rectangular cross section is electrically charged in a small region. The charged particles are then precipitated by the uniform field existing between the charged upper plate and the grounded lower plate of the wind tunnel as a long track along the lower plate. The size-frequency distributions of the particles precipitated at various points on the lower plate were determined from measurements on enlargements of electron-microscope photographs of samples of the smoke precipitated at various points. The agreement between theory and experiment is fair, but the range of sizes of the particles precipitated at a given point is rather large.

Additional Information

Copyright © 1947 American Institute of Physics. Received August 2, 1946. Our thanks are due to Professor Linus Pauling, who suggested this study, for his interest, advice, and encouragement. We are also indebted to Mr. George Standart for assistance with part of the experimental work, and to Dr. R.V. Langmuir and Mr. R. Rau of the California Institute of Technology, Mr. A.E. Smith of the Shell Development Company, and Mr. A.W. Einarsson of the University of California at Berkeley for their assistance in helping us to obtain electron microscope photographs. This work was done in whole under the Contract No. OEMsr-103, Supplement 1, between the California Institute of Technology and the Office of Scientific Research and Development, which assumes no responsibility for the accuracy of the statements contained herein. California Institute of Technology, Pasadena, California, Contribution No. 1054.


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