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Weighing the permeability cells in place
Performance and use of the apparatus
air bath air space aperture auxiliary ports balance arm balance pan beveled edge bottom center cabinet pictured CELL TO BALANCE cells in place centrifugal fan conditioning and testing conditioning cabinet coupling pin crank pin cross bar 52 desiccant and sealed desired hygrometric conditions determining water-vapor permeability dew point direct the air disk 36 equipment figure 9 filling the cell fork 53 freely suspended hanging from weighing heating coil hopper hung illustrated in figure INCHES Figure inner box leakage leveling plate lifting fork low position notch numbered permeability cells petrolatum pictured in figure plug-type closure port 33 position selected position shown relative humidity remove cells saturated salt solution scroll sheet-metal box shown in figure small port suspension disk tab guide 49 TABLE-TYPE CABINET temperature template test area testing cabinet testing chamber thermometers thermoregulator tropical atmosphere tube uncoupled vapor pressure waxing groove weighing hook 40 weighing rod weighing-hook assembly wet-bulb