Fire finder at the lookout tower. You peek through the hole in the gold-colored ruler to locate the fire and to measure where and how far the fire is. Back in the day, the location had to be exact as fire crews had to ride horses to get to the fires. Nowadays, they only use the range finder for a general location of the fire. If there are fires, they send out a helicopter crew to pinpoint the exact location of the finder.
We're busy conserving the environment