Practical sanitation; a handbook for sanitary inspectors and others;with apxon Sanitary law, by Herbert Manley . introduced. There are also other forms which act by thepressure produced by a vacuum which takes the place of thepressure in a service main. Although the Berkefeld filter(Fig. 3) differs from Pasteurs but slightly as regards externalappearance, in the vital element of the filter—namely, thecylinder—there is an important difference. It is composed ofdiatomaceous earth called Eieselguhr, and, although it has thesame external diameter, the internal cavity is very much smaller;in other
Practical sanitation; a handbook for sanitary inspectors and others;with apxon Sanitary law, by Herbert Manley . introduced. There are also other forms which act by thepressure produced by a vacuum which takes the place of thepressure in a service main. Although the Berkefeld filter(Fig. 3) differs from Pasteurs but slightly as regards externalappearance, in the vital element of the filter—namely, thecylinder—there is an important difference. It is composed ofdiatomaceous earth called Eieselguhr, and, although it has thesame external diameter, the internal cavity is very much smaller;in other words, the walls are much thicker. In appearance thematerial is not so smooth, it is also more porous and more go back to Dr. Johnstons experiments, he proved that the 30 PRACTICAL SANITATION. Berkefeld filter was not proof against the penetration of bacteriathrough its substance after periods of working varying fromfour to ten days, whereas the Pasteur filter during twenty-eightdays continuous working with water highly charged with micro-organisms discharged a perfectly sterile filtrate. In
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectsanitat, bookyear1904
