An apparatus that serves the purposes both of ventilating the inside ot Railway Cars and also of excluding the dust, has been invented by Samuel Sweet, of New York City, who has taken measures to secure a patent. The in vention consists in placing pipes of a gradual ly tapering form along the side edges of the outside roof oi the car, which run from end to end, and are furnished with self-acting shut ters that open or close, according to the direc tion in which the car is moving. The shut ters of one end being closed while those ot the other are open, and vice versa. The ob ject of this is to prevent the air from passing out when it has been once drawn in, as it is intended for ventilating the inside, and for this latter purpose branch pipes fit into the main pipes, by which tho air is conveyed into a water chamber, where it is purified of the dust and other extraneous matters that have been drawn in With it. This water chamber is divided into compartments and furnished with deflectors, which, from their shape, give a downward tendency to the current of air, dust, &c, so that the air, by being drawn down into the water, is purified and rises in a proper state for ventilation. This object is effected by an elliptic or oval-shaped pipe in the centre ot the ceiling, which has its side edges open or perforated, so that the air may escape in equal jets into the cars. The pecu liar shape of the distributing pipe and the con-Cave form of the ceiling against which it lies, causing the air to pass along the side oi the latter towards the windows of the car, and thereby preventing the entrance of the dust.