Say a known quantity of concentrated hydrofluoric acid was needed for an experiment, and this quantity was measured out in a measuring cylinder cleaned with water.
2.
Density cups are precisely measured cylinders that are made of stainless steel, and usually have a hole in the top through which excess liquid and air bubbles can escape.
3.
When metering pumps came into use, a small glass globe with a turbine inside replaced the measuring cylinder, but assured the customer that gasoline really was flowing into the tank.
4.
This flouts the intention of the rule, so it is possible that there may be a move to a measuring cylinder, under and across, the entire face of the stick.
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