Open AccessA stream-line filter
Author(s) -
H. S. HeleShaw
Publication year - 1923
Publication title -
proceedings of the royal society of london. series a, containing papers of a mathematical and physical character
Language(s) - English
Resource type - Journals
eISSN - 2053-9150
pISSN - 0950-1207
DOI - 10.1098/rspa.1923.0077
Subject(s) - subject matter , line (geometry) , deposition (geology) , organic matter , filter (signal processing) , attenuation , materials science , optics , analytical chemistry (journal) , chemistry , physics , geology , computer science , chromatography , sediment , mathematics , geometry , geomorphology , psychology , pedagogy , curriculum , computer vision , organic chemistry
Many years ago, when employing the method of stream-line motion with thin films of viscous liquid for investigating various problems, the author suggested the use of such films for studying chemical action and the deposition of matter from solution. In taking up the subject recently and employing in his laboratory a fairly large screen, so as to give great magnification with lantern projection, it was found possible, by giving certain forms to the channels in which the liquid was made to flow under pressure, to observe the behaviour of suspended matter and, further, to actually separate the coarser from the finer particles of the suspended material. When the film was reduced in thickness beyond a certain amount, say to 1/10,000 inch, or less not only was the matter in suspension prevented from entering, but the colour bands in the stream-lines became invisible. It was, at first, thought that this was due to the extreme attenuation of the colour. As a matter of fact, the liquid itself which passed through the film was found to have lost its colour.