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In a seismograph, The other components like weight pen and spring are sunspended in air, where as the rotating drum is directly attached to the group, which allows movement on ground to move the drum as well, making graph of the quake.

In a seismograph, drum is the part which is directly attached to the earth.

What part of the seismometer is attached to the ground?

The motion between the weight and the frame provides a measurement of the motion of the earth. A rotating drum is attached to the frame of the recording device and a pen is also attached to the weight which causes recording of ground motion in a seismogram. Any movement from the earth moves the frame which make a graph that shows the intensity of earthquake on the scale. A seismograph is also known as seismometer which is an instrument that is used to detect and record earthquakes.

So we can conclude that In a seismograph, drum is the part which is directly attached to the earth.

Learn more about earth here: https://brainly.com/question/15205710

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