as I have said before, was an old-timer and had a wooden hull. Now where a ship has a steel hull all you’ve got to do to make a ground is to simply connect the ground wire to a water pipe, or any other metal part of the ship, for these lead to the steel hull; as the hull sets in the water the very best kind of a ground is had without any trouble to get it. But what’s to be done when there’s nothing but an old-fashioned wooden hull between your instruments and the water? The way I did it was to run a wire from the instruments down to the engine room; then the assistant engineer fixed a 6 × 6 × 24 inch block of wood parallel with and close to the propeller shaft; this done we screwed a copper brush, that is a strip of stiff sheet copper, to the block so that it pressed flat on and hard against the shaft.
Under the head of one of the screws I looped the free end of my ground wire and screwed it down tight. This made a good enough ground connection through the shaft and the propeller keyed to it which was submerged in the water. With this transmitter, aerial and ground, I could cover 100 miles or so when the conditions were favorable.
