Long, Thin Letters - Iron oxide particles are blowing the sounds of Middletown all over the nation. Robert Emery, a man who claims, "I always brag about Middletown," is spicing his letters to friends with bits about this city. And Emery's letters, instead of being compounds of paper and pen and ink, are made of tape and a magnet and iron oxide. Recordings on tape have become Emery’s chief means of communication with other gadget enthusiasts in the United States, instead of slipping scribed notes into an envelope, Emery slips a three-inch tape into an envelope. Three cents remain the government tariff for mailing either the normal letter or the Emery letter. On a tape, Emery, who resides with his wife and three-year old son at 13 Bellemonte St., can whisper his good wishes, play a few musical recordings, offer some sage comments on the passing scene, and rebroadcast part of a Middie basketball game. The tape is three inches and will hold 10 minutes of sound...