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On the Transmission of Air and Micro-organisms through Berkefeld Filters

Published online by Cambridge University Press:  15 May 2009

William Bulloch  and
J. Anderson Craw
William Bulloch
Affiliation:
Bacteriologist to the London Hospital
J. Anderson Craw
Affiliation:
Research Scholar to the Worshipful Company of Grocers, Hon. Demonstrator in Physiology, London Hospital Medical College.
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In several former experiments by Bulloch and Craw (1906), Bulloch, Craw and Atkin (1908), and Craw (1908), we determined the relative efficiency of various filters in keeping back micro-organisms. The filters tested were the Doulton (“white” and “brown”), the Chamberland (“F” and “B”), the Berkefeld, and the Slack and Brownlow. Our methods of experimentation embraced filtration of cultures of microbes in bouillon, and the filtration of tap water under constant and variable pressures. The net result was that all the Slack and Brownlow, and nine out of ten of the Berkefeld filters employed gave contaminated filtrates within 15 minutes of the time the filtration experiment was commenced. Seven out of the ten Doulton “white” filters gave sterile filtrates for at least three days.

Type
Research Article
Information
Journal of Hygiene , Volume 9 , Issue 1 , April 1909 , pp. 35 - 45
Copyright
Copyright © Cambridge University Press 1909

References

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