Chrysler Hemi-powered air raid siren

Article on allpar showing the towers used, pretty neat.

Trenton’s Chrysler air raid siren comes down
Trenton’s Chrysler Air Raid Siren

The 1951-1957 version used a 180 horsepower Chrysler Industrial V-8 engine, a Hemi design; it weighed around 5,000 pounds, and was over 11 feet long, 5 feet tall, and nearly 5 feet wide. It was completely self-contained, not requiring any functional public utilities. This version drove a three-stage compressor that blew 2,610 cubic feet of air per minute into a siren rotor, where it was sent out through six horns at around 400 mph, produced 170 decibels at the siren’s throat. The unit was designed to rotate at around 1.5 rpm on its base, with a range of 30-50 miles and a 70 dB signal for two miles.