Acoustic Resonance

A curious vibration reverberated through the floorboards, originating from the slatted iron flank of the heating radiator. I approached the colossal structure, its painted coils rising like fortified battlements. Finding a discarded steel drafting ruler resting against the skirting board, I hoisted the implement with two hands. With measured force, I struck the lowest iron fin. A deep, sustained hum echoed through the metal chamber, vibrating through my armored gauntlets. The frequency was resonant, pure, and utterly under my command.