Homework Help

Describe the principle of float type recording rain gauge.

user profile pic

mahesh123 | eNotes Newbie

Posted July 31, 2013 at 2:12 PM via web

dislike 1 like

Describe the principle of float type recording rain gauge.

1 Answer | Add Yours

user profile pic

ncchemist | eNotes Employee

Posted July 31, 2013 at 11:26 PM (Answer #1)

dislike 1 like

A float type rain gauge works the same way as the fuel gauge in a car.  A floating unit made of something like styrofoam or a hallow rubber ball (anything that floats on water) is connected to one end of a lever arm.  The other end of the lever arm is connected to an electric resistor that is connected to an electrical system.  As the float rises due to water filling up the rain gauge, the lever arm adjusts the resistor to change the amount of current that flows through the system.  The electrical current also flows through some type of readout device, usually a needle pointing to a measuring scale.  As the current is altered by the level of the float changing, the needle on the readout device changes accordingly to show the amount of rain in the gauge.

Join to answer this question

Join a community of thousands of dedicated teachers and students.

Join eNotes