A chunk of exhaust pipe had split away, and was quivering before the rush of air like a reed in an organ pipe.
Not a fluttering whistle like the postman's, nor a heavy tone like an organ pipe or bass horn.
The organ pipe which ends in the larynx produces a very complex sound.
Our function is that of the organ pipe—to pick out the impulse, respond to it and give it volume and carrying power.
The air forced across the sharp edge is thrown into vibration and communicates its vibration to the air within the organ pipe.
They in turn cause the air above them to vibrate, much as the air in an organ pipe vibrates.
The next and last passage requires no remark, except that 'organ pipe of frailty' means simply the voice of the dying king.