Popular Science MonfJiIij 



probably is the most effective yet de- 

 veloped. However, many other kinds 

 have been patented. A Virginia man 

 named Dunlop produced the one depicted 

 on page 566. This is exploded through 

 the driving in of a pair of \vings upon the 

 bomb's striking the water. These wings 

 release a suitable clockwork, which must 

 run a short time before the primer is set 

 off. Meanwhile the bomb is supposed to 

 be sinking as a result of its initial velocity 

 in striking the water. Whether or not it 

 would always do this, and whether the 

 complicated clock mechanism would a-1- 

 ways run properly is open to doubt. But 

 obviously a clockwork is one way of ex- 

 ploding a depth-bomb and probably many 

 working on the general principle are in 

 current use. None of the Allied govern- 

 ments will tell precise details of the latest 



5(),> 



developments in depth-bombs, for the 

 Germans would be too interested. But 

 from a consideration of general types 

 already known in the depth-bomb field, 

 an idea of the underlying and fundamen- 

 tal principles may be obtained. 



Airplanes Use Depth-Bomb 



Not all depth-bombs are dropped by 

 destroyers. Airplanes have used them 

 with great success. On page 564 we show 

 a type produced by W. J. Hallock of 

 Jersey City. The explosive is contained 

 within a long, pointed cylinder at the 

 upper end of which is a detonator and a 

 small electric battery. An insulated 

 electric cable containing two wires is 

 attached to the upper part of the cylinder, 

 and leads to a relatively small parachute 

 which serves to straighten out the cable 



How an airplane "gets" a submarine. A depth-bomb causes a tremendous explosion caving 

 in a submarine anywhere in the vicinity. No wonder German submarine crews mutiny ! 



