Page:Popular Science Monthly Volume 91.djvu/213

This page needs to be proofread.


Popular Science Monthly

��197

��sharks to locate it. They approached cautiously at first and then attacked it, striking it with the force of a ram and tearing off huge pieces of flesh. Attached to the body of each shark, as the pictures show, were the usual pilot fish, clinging with the aid of sucker fins. As soon as a shark is dead the pilot fish attack it, eating their way through the dead body. One shark, Mr. Williamson observed, struck a projecting beam and was dazed mo- mentarily. The instant the other sharks saw this they fell upon the unfortunate one and literally tore it to shreds.

Ordinarily, sharks are easily caught with bait and hook, and frequently they become enmeshed in fishing nets. But no one has ever devised a scheme whereby they

��can be caught and killed in large numbers. One ingenious method is here illustrated. On each side of a small patroling vessel are mounted a number of rotary reels each of which carries an insulated electric cable. To the free end of each cable is secured a large fish hook carrying the bait in the form of a fish or piece of meat which is let down over the side of the ship almost to the water's level.

The reel drum has on one of its heads a number of contact pins which are con- nected with the insulated cable. As soon as the reel is turned slightly, one of these pins comes in contact with a stationary bracket connected with one pole of a dynamo supplying a current of 220 volts and five amperes, the other pole being con-

��One of the scenes photographed un- der-sea by the Wil- liamson Brothers for their thrilling film production, "The Submarine Eye." In this pic- ture Mr. William- son proves that a shark does not turn on its back to at- tack an enemy as is commonly supposed

���Sharks are easily caught with bait and hook. Here is shown the type of giant hooks used

��Notice the small pilot fish underneath the shark at the bottom of the picture. It clings to the shark by sucker fins and feeds on the body eventually

�� �