What are antonyms of seismograph?

There isn't a direct antonym for "seismograph" in the sense of a word meaning the opposite.

Here's why:

* Seismograph is a specific device. It's like asking for an antonym of "telescope" - there's no device that directly negates the function of a telescope.

* Antonyms typically refer to opposing concepts or ideas. While you could say "non-seismographic" or "non-seismic" to indicate the absence of seismic activity, this doesn't describe an opposing device or concept.

Instead of an antonym, you could consider words that describe what a seismograph *doesn't* do, such as:

* Barometer: Measures atmospheric pressure, not ground movement.

* Thermometer: Measures temperature, not seismic activity.

* Compass: Indicates direction, not ground movement.

In essence, "seismograph" is a unique term, and finding a true antonym is unlikely due to its specific function.