EQUIPMENT 



Where the water is cold, a suit of woolen underwear is important. 

 The body becomes chilled quickly and after being on the bottom for 

 fifteen minutes the diver finds himself shaking when he arrives on deck, 

 and is reluctant to go down again very soon. People who fear sharks 

 probably think they would prefer a suit of medieval armor. It would 

 not help, however, because when the shark found he couldn't get 

 through the armor he would probably get mad and bite oif the air-hose. 



The Camera 



Both still and motion pictures can be taken under water. Illustrations 

 are shown here of my cameras and cases. For the motion picture camera 

 a very simple case was made of sheet-brass joined at the seams by solder. 

 Because of electrolytic action caused by contact of the two metals with 

 salt water, it has been necessary to go over the seams with a soldering 

 iron each year but it has served my purpose for four seasons. The case 

 should be tested before use by closing it empty and letting it lie on the 

 bottom in about ten feet of water for several hours. After raising it, wipe 

 the water off the outside before opening for inspection. 



The camera is placed in the case from the rear, and the lens extends 

 into the opening which is provided with a window of plain glass. The 

 starter is opposite an opening which is covered by a piece of sheet rubber. 

 It can easily be operated by feeling for it through the rubber. There- 

 fore, it is not necessary to have any moving part to project through the 

 case. The case described is designed for a camera which has a starter 

 that is operated by pushing it in a direction parallel to the case. If the 

 camera to be used has a starter that is operated by pushing it inward, 

 trouble may arise from the water pressure acting in the same manner as 

 the finger on the rubber, and starting the camera. It may be necessary 

 to make a starter similar to the kind described for the still camera. No 

 provision is made for winding the mainspring or changing diaphragm 



