Intercomparison of eleven condensation nucleus counters

*Universifiit Mainz, Saarstr. 21, 6500 Mainz, F.R.G. tDefense Technology and Procurement Group, NC Laboratory, 3700 Spiez, Switzerland :~ Universit~t Duisburg, Bismarckstr. 81, 4100 Duisburg !, F.R.G. § Deutscher Wetterdienst, Frahmredder 95, 2000 Hamburg 65, F.R.G. IINetherlands Energy Research Foundation, Postbus 1, 1755 ZG Petten, The Netherlands ¶ Nuclear Physics Laboratory, Proeftuinstraat 86, 9000 Ghent, Belgium ** Gesellschaft fiir Strahlenund Umweltforschung, PauI-Ehrlichstr. 20, 6000 Frankfurt, F.R.G. l t Luwa AG, Kanalstr. 5, 8152 Glattbrugg, Switzerland :~:~TSI GmbH, Schmiedstr. 3, 5100 Aachen, F.R.G.