There was still considerable to do in the way of preparing the Sky-Bird and themselves for the long trip, and for weeks all four boys were kept hustling to make the final installations of accessories and equipment. Bob rigged up a wireless telegraph in connection with his telephone set, and for protection, four good repeating rifles and an automatic shotgun were put in racks in the after-cabin, while each fellow provided himself with an automatic revolver which he would carry in a holster attached to a belt.  Medium-weight flying suits, with a heavy, wool-lined coat to slip on in case they flew very high, and trim flying boots and soft gloves, made up the personal toggery.