title: A "T.V.-scanning-line comparator" for recording locomotory activity of animals.
abstract: A T.V.-scanning-line-comparator is described for making long-term records of locomotory activity and speed of animals. The apparatus is used in combination with a closed circuit T.V.-system. The animals are counted when they pass a fictitious line corresponding with a scanning-line of a T.V.-picture.
authors.affiliation: Zoological Laboratory, Department of Ecology, University of Leiden, Leiden.|Electronics Department, University of Leiden, Leiden.
authors.forename: Martje Kruk-de
authors.initials: MK
authors.lastname: Bruin
authors.affiliation: Zoological Laboratory, Department of Ecology, University of Leiden, Leiden.|Electronics Department, University of Leiden, Leiden.
authors.forename: Otto
authors.initials: O
authors.lastname: Tissing