Float type flow responsive switch with flow resistance means in float chamber outlet

Claim 1

A LIQUID FLOW METER FOR INDICATING SLIGHT CHANGES IN FLOW RATE COMPRISING: (A) A BODY FORMING A CHAMBER, MEANS FORMING AN INLET PASSAGEWAY AND AN OUTLET PASSAGEWAY COMMUNICATING WITH SAID CHAMBER, SAID OUTLET PASSAGEWAY BEING POSITIONED WITH RESPECT TO SAID CHAMBER AND CONTINUOUSLY OPEN TO CONTINUOUSLY DRAIN SAID CHAMBER FROM A HIGH LIQUID LEVEL TO A LOW LIQUID LEVEL, (B) MEANS FORMING A PRESSURE VARIABLE RESISTANCE TO OUTLET FLOW THROUGH SAID OUTLET PASSAGEWAY WHICH DECREASES AS FLOW RATE DECREASES AND INCREASES AS FLOW RATE INCREASES PRODUCING A PROPORTIONALLY MORE RAPID DECREASE AND INCREASE IN LIQUID LEVEL IN SAID CHAMBER THEN CHANGE IN FLOW RATE INTO SAID CHAMBER, (C) A MEMBER CONTAINED IN SAID CHAMBER AND RESPONSIVE TO SAID DECREASE AND INCREASE IN LIQUID LEVEL, AND (D) MEANS ASSOCIATED WITH SAID MEMBER AND CONTROLLED THEREBY FOR PRODUCING A SIGNAL IN RESPONSE TO A PREDETERMINED CHANGE IN SAID LIQUID LEVEL.