. St. Thomas's Hospital reports . ^; through rubber tubing sufficiently long to allow the filter tobe moved easily to any part of the operating room. The filter, Fig. 3, which is 12 inches long by about 3inches in diameter (outside measurement), consists of acylinder of compressed kieselguhr enclosed in an iron the figure the position of the filtering cylinder is indicatedby the dotted lines. The water entering at a fills thespace between the jacket and the cylinder ; it is driventhrough the latter, and escapes sterilised by the tube filter is mounted on an iro
. St. Thomas's Hospital reports . ^; through rubber tubing sufficiently long to allow the filter tobe moved easily to any part of the operating room. The filter, Fig. 3, which is 12 inches long by about 3inches in diameter (outside measurement), consists of acylinder of compressed kieselguhr enclosed in an iron the figure the position of the filtering cylinder is indicatedby the dotted lines. The water entering at a fills thespace between the jacket and the cylinder ; it is driventhrough the latter, and escapes sterilised by the tube filter is mounted on an iron tripod provided with rubber-tyred wheels to enable it to be easily moved about theoperating table. With 12 feet of tubing between the coiland filter it is found that the temperature of the water Sterilised Water. 55 passing from the thermometer t, Fig. 2, to the orifice ofB, Fig. 3, falls from 2° to 5° F. according to the rate offlow. That is, if water at 100° F. be required the thermo-meter should indicate 102°—105° When hot water is not available the coil may be used thus:—Cold water is passed through the coil, the space outside beingalso filled with cold water. A gas burner placed beneaththe cylinder heats the water around the coil, the waterpassing through being brought to the desired temperatureeither by regulating the gas burner or by opening the tap d. In places where the pressure in the hot and cold waterpipes is the same, the waters may be mixed, before enteringthe coil, in the proportion to give the desired of temperature by the flow of cold water throughc to D, Fig. 2, is then unnecessary. It is advisable evenin this case to have the coil arranged as shown, for in caseof failure of the hot water supply, gas may be used as thesource of heat. 56 Sterilised Water. The sterilising power of the filter has been tested at theend of one hours, twenty-four hours, and forty-eight hourscontinuous passage of water. In no case could an
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