FIRE-CONTROL RADARS FOR NAVAL VESSELS 



41 



intervals. Other contacts on this assembly provide left-right and up- 

 down image spacing. 



V'-N 



\\ .V 



\4if 



Fig. 33 — Mark 4 — antenna on gun director 



Except for the new antenna and the additional Train or Elevation In- 

 dicator for the Pointer (elevation operator), this radar was identical to 

 Radar Mark 3. The first demonstration of a development model of Radar 

 Mark 4 was made at Atlantic Highlands, New Jersey, in September 1941 

 and this model was installed aboard the destroyer U.S.S. Roe the latter 



