Abstract: A device for dispensing a predetermined, measured quantity of liquid from an inverted bottle incorporates a delay mechanism whereby a plunger within the measuring chamber is held in an open condition for a predetermined period of time sufficient to ensure delivery of the entire contents of the measuring chamber. The delay mechanism is associated with a linkage system whereby an operating member disposed adjacent to the outlet of the measuring chamber is coupled to the plunger and comprises a piston which is driven in a cylinder by a spring at a rate determined by the rate at which a fluid flows through a restricting orifice.