Tubular dropper for micro-titration

Claim 1

A TUBULAR DROPPER ELEMENT ADAPTED TO HAVE ITS DISCHARGE END DIPPED INTO A BODY OF LIQUID FOR WITHDRAWAL BY SUCTION THEREINTO OF A PORTION OF THE LIQUID IN SAID BODY AND FOR THEREAFTER PRODUCING BY RETURN, GRAVITY FLOW A SERIES OF DROPS OF LIQUID OF PRECISELY UNIFORM MINUTE VOLUME IN THE ORDER OF A FRACTION OF A MILLILITER, SAID DROPPER ELEMENT HAVING A DISCHARGE END WHICH IS IN THE FORM OF A CIRCULAR LINE FORMED BY THE INTERSECTION OF A PAIR OF COAXIAL SURFACES OF REVOLUTION, THE INNER ONE OF WHICH IS OUTWARDLY FLARED AND CONE-LIKE, SAID TUBULAR DROPPER ELEMENT HAVING A THROUGH BORE, SAID OUTWARDLY FLARED SURFACE OF REVOLUTION FORMING THE TERMINAL PORTION OF SAID TUBULAR ELEMENT BORE, THE OTHER OF SAID SURFACES OF REVOLUTION EXTENDING AT A SUBSTANTIAL ANGLE FROM THE PLANE OF SAID CIRCULAR LINE TOWARD THE OTHER END OF SAID TUBULAR DROPPER ELEMENT SO THAT DURING DROP FORMATION ON SAID OUTWARDLY FLARED SURFACE OF REVOLUTION BY SAID RETURN FLOW THE LIQUID WITHIN THE DROP BEING FORMED IS ISOLATED BY SAID CIRCULAR LINE FORMED BY THE INTERSECTION OF SAID SURFACES OF REVOLUTION FROM ANY LIQUID OF SAID BODY OF LIQUID WHICH MAY BE ADHERING TO SAID OTHER SURFACE OF REVOLUTION WHEREVY SAID OUTWARDLY FLARED SURFACE OF REVOLUTION CONSTITUTES THE SOLE SURFACE OF SAID DROPPER ELEMENT TO WHICH LIQUID FORMING A PART OF A DROP CAN ADHERE DURING DROP FORMATION.