He had not done speaking, before the shrill whistle of a boatswainrose gradually on the ears of the listeners, until the sense of hearingbecame painfully oppressed by the piercing sounds that rang underthe arched roof of the hall, and penetrated even to the most distantrecesses of the abbey. A tremendous rush of men followed, who drove inbefore them the terrified fragment of Borroughcliffe's command, that hadheld the vestibule; and the outer room became filled with a dark mass ofhuman bodies.

Electronic collars (also known as E-collars) transmit a remote signal from a control device the handler operates to the collar. An electrical impulse is transmitted by the handler remotely, at varying degrees of intensity, from varying distances depending on range frequency. It is also done automatically in the bark electronic collar to stop excessive barking, and invisible fence collar when the dog strays outside its boundary. Electronic collars are widely used in some areas of the world and by some dog obedience professionals. This technique remains a source of controversy with many dog training associations, veterinary associations and kennel clubs.[6]

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