title: A "Border-Line detector" for recording locomotory activities of animals.
abstract: A T.V. Border-Line detector is described for making automatic long-term records of locomotory activity of animals.The apparatus is used in combination with a closed T.V. system. A video recorder is switched on for some seconds at the moment an animal passes a fictitious detection line corresponding with a scanning-line of a T.V.-picture.
authors.affiliation: Zoological Laboratory, Department of Ecology, University of Leiden, Kaiserstraat 63, Leiden, The Netherlands.|Electronics Department, University of Leiden, Kaiserstraat 63, Leiden, The Netherlands.
authors.forename: J C
authors.initials: JC
authors.lastname: van Lenteren
authors.affiliation: Zoological Laboratory, Department of Ecology, University of Leiden, Kaiserstraat 63, Leiden, The Netherlands.|Electronics Department, University of Leiden, Kaiserstraat 63, Leiden, The Netherlands.
authors.forename: R W
authors.initials: RW
authors.lastname: van der Linden
authors.affiliation: Zoological Laboratory, Department of Ecology, University of Leiden, Kaiserstraat 63, Leiden, The Netherlands.|Electronics Department, University of Leiden, Kaiserstraat 63, Leiden, The Netherlands.
authors.forename: A
authors.initials: A
authors.lastname: Gluvers