Wiktionary
firewatcher
n. A person who looks for the onset of fires, normally from a high vantage point
Usage examples of "firewatcher".
The attempt led to the murder of the floor duty firewatcher, radio-operator Edwina Haas, and to NCIS official attention.
From their rickety wooden towers high above the rooftops, the firewatchers rang bells at the first sight of a flame.