FIGURE 6.10 

 PLASTIC CAST 

 OIL-FILLED 

 PHOTOCELL 



Another device which takes advantage of the ocean and the 

 environment is the early design of a fluid-filled barrier -layer 

 type of photoelectric cell, potted with an epoxy resin with a cable 

 connected (fig. 6.10). This can operate at any depth in the ocean 

 without additional packaging. 



For biological and other work it is necessary to determine the 

 total and the instantaneous amount of solar radiation. The 

 PYRHELIOMETER on top of the box (fig. 6.11) would normally be 

 mounted on top of the ship's mast and stabilized. The output from 

 this is amplified, chopped, etc. , and fed to the current coil of a 

 standard watthour meter. The watthour meter does the very 

 simple arithmetic of integrating and giving readings in conventional 

 units with which the biologist is familiar. The other meter indicates 

 the instantaneous values. 



Another device for biologists offers much greater possibility. 

 Here the total amount of light reaching a given depth over, say, a 

 week or a month, was measured by the AMBIENT LIGHT RE- 

 CORDER, a self-generating type of photoelectric cell of the 

 barrier -layer type (fig. 6.12). The total dimension of the device is 

 about ten inches from top to bottom. It possesses sufficient 

 buoyancy in the upper section so that it floats with the light- sensi- 



41 



