Metered drop dispensers

In a metered drop dispenser device which includes a liquid reservoir, a drop forming means connected to the reservoir having an orifice at which drops of the liquid can be formed, a drop chamber coupled to the drop forming means through which drops fall and in which drops accummulate, a discharge device coupled to the bottom of the drop chamber for conveying the liquid to a utilization means, a metering means associated with the drop chamber for determining the drop rate, and drop rate control means to vary the drop rate, the improvement in the drop forming means comprising:

• a pair of coplanar and spaced apart plate members having substantially parallel, planar facing end walls.