FIRE-CONTROL RADARS FOR NAVAL VESSELS 



45 



Size or larger, was equipped with one or more of these equipments early in 

 the war. A total of 139 Mark 3, and 670 Mark 4 radars were built, in- 

 cluding those used ashore at schools. Although some of these equipments 

 were replaced b}- more modern designs before the end of the war and some 

 were lost hi battle, tliere were still approximately 85 Mark 3 anfl 300 Mark 4 



Fig. v38— Mark 4 Radar — trainer & pointer operators' positions on .\ircraft Carrier Saratoga 



(Navy Photo 177347) 



radars in service in the fleet on V-J day. The first four Mark 4's, Serial Nos. 

 1, 2, 3 and 5 installed on the battleship Washington were used until the 

 middle of 1945, although newer designs had been going on all new vessels 

 for more than a year. 



These early equipments were the "guinea pigs" of lire control radar. 

 They were the instruments with which our fleet learned to fight eflfectively 



