I remember the fire towers and the poor sods who were in them for months without a break, solar power was in its infancy and generators a a huge bank of batteries were required, supplies were dropped off once a fortnight and often that was the only human contact, during the holiday season they would get visitors who came for a look, took a special introvert to tolerate the solace.
I worked out of an office that had the big map on the wall to triangulate the smoke sightings, each tower was marked and had a red string that pulled out of the map to a compass point, this applied to all the towers in the region and where they all crossed was the source of the smoke, towers were up to 100km apart and not all could see the smoke, we had about 10 towers to cover the region, some were on top of towers while others were on top of a bare hill with clear vision at least 180 degrees, the towers were 360 degrees.
Haven't been up there since the late 80's and have no idea if they still exist.