SONAR

(See also Bat; Communication; Electronics; Radar; Ships; Sound)

difficulty in finding young men to operate: g83 1/22 30

examples in creation: ce 158-159; w61 643; g59 4/22 14-15; g55 5/22 16; g53 2/8 23

bat: g78 2/8 17-18

dolphins: g79 4/22 23

porpoise: w61 643

for blind persons: g78 2/8 16-19