Special Features:

1 to 20000 yd scale ratio; time difference scale 5 to 1 graduation in degrees for irregular base plotting 1 ea 4, 4.5, and 5.5 sound-second sub-base lg grad; for specific use ord u/w sound ranging wind corrector model m1; all components and/or accessories listed in ord 7 snl-154; used to determine location of enemy guns by plotting difference in tine at which the sound of the gun reaches ea of several microphone stations

Properties:

An item used to determine the location of enemy guns by plotting the difference in time at which the sound of the gun reaches each of several microphone stations. It may also be used for adjustments of gun and howitzer fire to compensate for the trajectory of the projectile. Excludes sound ranging set and sound measuring set.