. Public health and preventive medicine. er, lumps of ice may be placed in thetube to cool the entering air, which, conversely, may be heated in winter by agas jet placed under the tube where it turns upwards after coming throughthe wall. The exit should also be screened. Ere this we have observed hats,carefully laid upon the gaping inner end of a Tobins tube, promptly disappear,to the amazement of the hapless owners unversed in ventilating apparatus !The mean calibre of the tube should be between 6 and 12 in. in diameter,and the tube itself should be curved, and not bent at right angles, wher
. Public health and preventive medicine. er, lumps of ice may be placed in thetube to cool the entering air, which, conversely, may be heated in winter by agas jet placed under the tube where it turns upwards after coming throughthe wall. The exit should also be screened. Ere this we have observed hats,carefully laid upon the gaping inner end of a Tobins tube, promptly disappear,to the amazement of the hapless owners unversed in ventilating apparatus !The mean calibre of the tube should be between 6 and 12 in. in diameter,and the tube itself should be curved, and not bent at right angles, where itpasses from the wall into the room. It is usually made of wood, and the exitshould be from 5 to 6 ft. above floor level, as the draught shoots the airspray another foot or two upwards after leaving the tube. This spray shouldhave a free exit and not strike against an overhanging shelf or projection ofany kind. Tobins tubes are apt to get dirty and clogged, so that thegratings should be removable for the purpose of frequent Fig. 103.—Tobins tube. 320 SANITARY ENGINEERING Sheringhams valviouter wall or in a \\ <<•-:
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectprevent, bookyear1902
