1920] 



on The Gyrostatic Compass 



path, without wobble, and I find that the plate still goes round with 

 the circular movement. 



This should be of interest to the mathematicians. 



Before I leave the instrument I will set it spinning, so as to 

 demonstrate to you the frictionlessness of the vertical axis. 



It is rotating now entirely by means of the energy of the motion 

 of the plate, and I think you will find at the end of the lecture that 

 it is still revolving, but of course not so fast as at present. 



The magnetic compass is a simple piece of apparatus, but it is 



Fig. 2. — Steering Repeater. 



complicated in its readings and corrections, and points to the mag- 

 netic north. The Gyro-Compass is a complicated instrument, but is 

 simple in its readings and points to the true north. 



Before proceeding to describe the Gyro-Compass, I had better 

 say a few words about the equipment in front of you. The Gyro- 

 compass is in full operation, and is at the present moment recording 

 its movement upon a travelling strip of paper. 



