Here's a breakdown:

* Thermograph: A device that continuously records temperature data, often over an extended period. This data is typically displayed as a graph, showing temperature fluctuations against time.

There are different types of thermographs, including:

* Chart recorders: These use a pen or other marking device to record temperature on a moving strip of paper.

* Digital data loggers: These record temperature data electronically and store it in digital format.

* Infrared thermographs: These measure temperature using infrared radiation, often used for imaging heat signatures.

Let me know if you have any other questions!