A condensation nucleus counter with stereo-photomicrographic recording

In order to discriminate better in photograms of the graticule of anAitken type nucleus counter between droplets formed around the nuclei and spurious condensation products or extraneous matter on both sides of the graticule, a nucleus counter with stereo-photomicrographic recording has been constructed. Its description together with a sample stereogram is given. The advantages of stereo-photographic recording are demonstrated.