I can only think of two things that could be described as spinning apparatus on the front of a fire truck.
Spinning light on front of firetruck.
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Roto rays are three sealed beam lights rot.
It s called a roto ray these were popular on pre ww ii apparatus but have made a come back in the last several years.
One would be a mechanical siren encased in a circular chrome plated encased and mounted on the front of a truck.
They were made at the time that there really weren t any flashing lights so instead of the single rotating light on top of the truck they put this piece of crap on.
What is the technical name for the spinning light of the front of a fire engine called.
Got done with a house fire went to sit on a front bumper and ended up with 8 staples in my head from one of those.
For those of us who grew up in or around east coast fire companies as children they are something we cherish dearly a unique spinning tornado of light on the front of a shiny engine or truck.
The are old and out of date piece of emergency lighting.