[Illustration: The Mediterranean Felucca, swift in all weathers.]
[Illustration: Fig. 38. Master Compasses on Long Run Floor Test.
Fig. 39. Master Compasses under Test on Special Machine constructed to
simulate the motion of a Ship in a Heavy Sea.]
[Illustration: The Submarine, the unseen terror of the seas.]
_Sperry Service_
When a Gyro-Compass is sold the interest of The Sperry Gyroscope
Company does not cease. Our interest in our customer is only beginning.
An experienced service engineer installs every Sperry Gyro-Compass.
This engineer is also available to make the first trip with the compass
in order to assure its proper operation. After installation the Sperry
Service Engineers are available in every large port in the world to
come aboard and inspect, clean, repair and overhaul the Gyro-Compass
equipment so as to keep it in first class operating condition. A
radiogram sent to any of the Sperry Service Stations will bring a
Service Engineer to meet your ship. During the first year there is no
charge. After this period a reasonable charge is made for the service.
Such a charge is similar to that at present made by compass-adjusters.
A list of the Sperry Representatives is given on the title page of this
book.