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BELL SYSTEM TECHNICAL JOURNAL 



at night and thereby gain a large advantage over the enemy whose radar 

 was feeble and inaccurate. They played a part in ever>' one of the early 

 battles and most of the later ones in the Pacific. They controlled the cruiser 

 Boise's guns in October 1942, when she blazed away at night at a vastly 

 superior fleet in the Solomons and made the enemy pay 10 to 1 for the 



Fig. .^y- 



-J\;id;u Mark 4 — trainer ct poinlt-r operators' [iositions on Destroyer Jiarton 

 (Navy Photo 181775) 



damage they succeeded in doing. They were with the cruiser San Francisco 

 on a night m November 1942, when a small U. S. force sank 27 enemy ships, 

 almost completely destroying a large Japanese convoy bound for Guadal- 

 canal when our hold there was at best precarious. The Mark 3 steered 

 the big guns of the battleship South Dakota in the Solomons on the dark 

 night of November 4, 1942, when she sank a major Japanese war vessel 

 eight miles away with two salvos. Even in engagements in broad daylight 

 when optics could be used for target angles these radars still played a vital 



