. Public health laboratory work, including methods employed in bacteriological research, with special reference to the examination of air, water and food contributed . Fig. ig,—A water-bath improvisedfrom an ordinary beaker. Fig. 20.—A water oven. contain a trace of moisture, it is therefore subsequentlytransferred to the oven, where absolute drying can beeffected (fig. 20). 27. A packet of Swedish filter papers. 28. A long tube of thin colourless glass, known as the two foot tube, employed in judging some of thephysical characters of water. 29. A box of test papers, red and blue litmus andlea
. Public health laboratory work, including methods employed in bacteriological research, with special reference to the examination of air, water and food contributed . Fig. ig,—A water-bath improvisedfrom an ordinary beaker. Fig. 20.—A water oven. contain a trace of moisture, it is therefore subsequentlytransferred to the oven, where absolute drying can beeffected (fig. 20). 27. A packet of Swedish filter papers. 28. A long tube of thin colourless glass, known as the two foot tube, employed in judging some of thephysical characters of water. 29. A box of test papers, red and blue litmus andlead papers. 30. A long thermometer graduated in Fahrenheitdegrees. 12 LABORATORY WORK. 31. Indiarubber corks (perforated and imperforated) tofit the boiling flasks. 32. A desiccator. A desiccator is simply a glassshade inside of which there is a vessel containing some. Fig. 21.—A desiccator. agent which will keep the air free from moisture (suchas strong sulphuric acid). A residue completely dried byheat will otherwise absorb a little of the vapour fromthe atmosphere while cooling, and thus increase slightlyin weight (fig. 21).
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherphiladelphiablakis
