This compass has a copper/bronze bowl gimbal. The inscriptions read "No 13265" "HUSUN," Hughes trade literature describes this form as having been "especially designed for the navigation of Yachts and Motor Craft, the rapid movements of which demand a compass of exceptional steadiness and sensitivity." To that end, it has a special expansion chamber that "precludes the formation of bubbles in the liquid." The needles are short, and made of cobalt-steel. The card is printed "by a new photographic process that eliminates discoloration." And patented damping filaments ensure the steadiness of the card.British Patent #127,135 describes an "Aperiodic Magnetic Compass" made by attaching to the magnetic needle filaments of glass, wire, or other suitable non-magnetic material. This patent was granted in 1919 to George Campbell and Geoffrey Bennett, both of the Compass Department of the British Admiralty. With a gimbal suspension (for example, from a ship's compass), the object is suspended within a circular ring on two hinges aligned along the center of the circle; the round ring itself is also hung in the same way in a somewhat wider ring, but with hinges on a line that is perpendicular to the first. Is expertly packaged and registered and sent insured with T&T code. Due to the volume, this lot can only be sent to countries within Europe.