My favorite recording meter

This is right near my house, tucked between a couple of buildings in the Script Pro complex off Johnson drive. More photos of it Seems to be something from the gas company. If you can't tell by looking, its a disk of paper, adhered to a very slowly moving metal disk. An ink needle drives a trace based on... whatever. Gas pressure I presume. Sorta like the classic seismometer, but its a disk (not a long tape) and records over a one month period. And, its still working. The paper is regularly changed, and presumably someone is reading the information. Seems to work just fine, therefore. I just wonder how long until its replaced by a digital device, feeding back to the home office by wires or radio.