Various, Chambers's Journal of Popular Literature… (1853)
“ Placing us so as to insure fair-play to the men and horses, and assuring us that no one in the building but ourselves is in the secret of his intention, he approaches the gong, and touches a spring which sets the electric current working. The transformation is instantaneous. The gong sounds sharply; the doors of the stalls fly open; a whiplash, suspended like the sword of Damocles over the hosecart horse’s flanks, descends sharply, and sends him off down the narrow gangway at a swinging trot. His companions follow, and range themselves in place on either side of the engine-pole. ”
