Federal Signal STH-10 Siren Drill dB Test

Decibel Meter to see how loud a drill run with a 22 inch rotor in my 1950s Federal Signal STH-10A really is. next test, will be with a RPM counter
bearing are new, still has to get broken in so thats why for the short wind down, i may remove the grease and replace it with oil
this thing threw quite a breeze when it was at high RPMs

Disclaimer: NOT FOR KIDS- doing this action is done at my own risk. Dealing with Genuine Locomotive Horns Such as Nathan Airchime and Leslie Controls produce extreme loudness and these horns do NOT comply with Local Laws and authority and this is A MISDEMEANOR. operating such devices WILL cause permanent hearing damage loss. Operate such horns and Air Raid Sirens at your own risk.