VERTICAL AND HORIZONTAL MOVEMENTS IN THE OCEAN 



601 



Fig. 1. To illustrate vertical yawing of a hoist of water bottles worked during 

 windy weather from a ship which cannot maintain a vertical wire. The arrow^s 

 represent direction and strength of a variable wind. {Middle) efTect of a strong 

 gust on the depth of the hoist of bottles; {left) what happens when the gust dies 

 away. The messenger is showm running between bottles during the vertical yaw. 

 On such a hoist thermometric depths may appear discordant as between water 

 bottles while duplicate temperatures from the same frame may agree poorly. 



sink. Consequently during gusty weather, there will be a tendency 

 to vertical yawing of a hoist worked from a ship from which the 

 wire cannot be maintained nearly vertical. 



Table I presents data for a near vertical hoist. For such a hoist 

 the difference between the duplicate temperatures is usually no 

 more than 0.01°; a difference of 0.03° is exceptional. Similarly, a 

 difference between paired measurements of depth as great as 1 1 m 

 (as at 2200 m) is rather uncommon. 



Table II presents data for a hoist with a surface wire angle of 

 45°. There are two differences in observed temperature of 0.03° 



