Abstract: A metering apparatus including a metering pump having a vertical, elongate pump cylinder tapered at one end to a point, and a piston arranged for axial movement in said cylinder, facilitates transfer of an accurately determined volume of liquid from a first vessel to a second vessel. A method of transfer involves lowering the pump into the first vessel; with the point extending into the liquid contained therein; withdrawing the piston through a first distance such that a volume of liquid substantially exceeding the volume to be transferred is drawn into the pump cylinder; raising the pump slowly, until the pointed part of the pump cylinder occupies a position above the surface of the liquid; advancing the piston through a distance which corresponds exactly to the first and second distances so that the desired amount of liquid is dispensed to the second vessel.

Abstract: An identity card contains a radioactive substance and information on the intensity of the radiation of said substance. When the card is used, for example in a banking transaction, the current intensity is measured and compared with the information on the intensity given on the card. If the current intensity and the given intensity agree, the card is to be considered genuine.