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<br />42 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />concentrations present in the tunnel. When monodisperse aerosols were <br /> <br />required, sampling was done directly from the tunnel into the <br /> <br />electrostatic classifier. The classifier design also assured a "dry" <br /> <br />sample. The monodisperse aerosols were stored in the Velostat bags <br /> <br /> <br />mentioned previously. Inj ection into the dynamic cloud chamber was <br /> <br /> <br />achieved by venting the bag through the sample inject port, using the <br /> <br />pressure differential between bag and chamber. For isothermal chamber <br /> <br />injections, the sample was transfered from the velostat bag to a 4 L <br /> <br />sample syringe for manual i~jection. Size distributions and total <br /> <br />particle concentrations of ice nuclei aerosols are obtained by using <br /> <br />the classifier in series with the condensation nucleus counter. <br />