Changes in the temperature of the stack, due to shifting of the wind
and force of draft, vary its magnetic characteristics. Consequently the
Magnetic Compass is affected.
Temperature changes do not influence the Sperry Gyro-Compass.
No matter what the conditions are that change the magnetic
characteristics of the stack, ship or cargo, they cannot affect the
Gyro-Compass, as it has nothing whatever to do with magnetism.
[Illustration: Fulton’s Clermont ushered in the age of steam.]
[Illustration]