echo ranging gear to the manufacturer through BuShips „ Later 

 the Design Section and manufacturer found a way to make the 

 necessary changes in design. 



Another field engineer was able to increase the effec- 

 tiveness of a harbor defense system because he could apply 

 hi s knowledge of shipboard echo-ranging gear to a land de- 

 fense system. The projector training system cf a harbor 

 defer.se equipment needed simple repairs. The field engineer 

 assigned to clear up the trouble devised a different type 

 of training control which he made from spare radar parts. 

 His improvements were highly satisfactory and provided more 

 accurate, trouble-free operation. While making the repairs, 

 he made additional improvements to increase the effective- 

 ness of the defense system. 



Introduction and Installation of New Equipment. 



As has already been seen, the field of engineers intro- 

 duced mary new pieces of sound gear to the fleet s, The 

 bearing deviation indicator has been mentioned. Other gear 

 introduced included: (1) applique components for maintenance 

 of true bearing (MTB) ; (2) console-type echo-ranging gear; 

 (3) submarine sonic listening systems. In the field cf 

 ordnance, field engineers assisted in introducing the forward- 

 firing hedgehogs and mousetraps. Also, numerous training aids 

 were introduced „ 



In dealing with tbe early major problem of adapting and 

 improving e xisting underwater sound equipment, rather than 

 introducing complete new sound systems, field engineers con- 

 verted or adapted a total of 85 t' T pes of equipment. In most 

 cases the job was done with little cr no interference with 

 operations . 



The story of two field engineers who were ordered to 

 help install a bearing deviation indicator and maintenance 

 cf true bearing equipment on a ship at Pearl Harbor tells 

 how engineers helped to introduce complicated devices to 

 ASW crews. During the latter nart of hay, 1944, several 

 BDI and MTB units arrived in Pearl Harbor to be installed 

 in ASW craft. The units were checked and adjusted by the 

 field engineers. The first ship selected for the installa- 

 tion of these units was one with an excellent ASW record, so 

 every effort was made to finish the job quickly and return 

 the ship to active duty. 



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