Abstract
This note describes a simple meter for measuring low mean velocities at a point in a flow. A transparent conical nozzle is aligned with the flow, its apex pointing upstream. A fine jet of dyed fluid is directed into the downstream end of the nozzle and an interface forms between the dyed jet and the working fluid. The jet discharge is adjusted by raising or lowering a head tank until the interface is seen to reach a reference point at the nozzle tip. The meter is then in a state of balance. The meter is easy to make and use. The nozzle can be as small as 04 inch long by 015 inch in diameter, and velocities in the range 003-10 ft s−1 can be measured with an accuracy to better than 8%.
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