“ It is simply a tall cylinder of galvanized iron resting in a large basin or pan, and connecting at the top with the ordinary stovepipe or with a tube leading out of the widow. In the top of the cylinder’s interior is a perforated tubular ring, and on a cock being turned on this ring an artificial shower is caused inside the cylinder. The water thus flowing down the sides takes a rapid spiral motion, which sucks the air down through the cylinder at a rapid rate, a fine spray inside cooling the air thus entering, reducing its humidity to normal and taking out all dust and bad odors ”