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Prof. E. W. Wood : Fish-Eye Views 



was covered with a metal cap operated by a handle on the 

 outside o£ the pail. The apparatus was placed on the ground, 

 and the surface of the water covered with a sheet of glass to 

 prevent ripples, the pail being so full that the glass was in 

 contact with the water. This arrangement obviated the 

 necessity of immersing the affair in a pond, since the function 

 of the latter was performed by the water in the pail above 

 the lens. A diagram of the arrangement is shown in fig. 1_, 



Fig-. 1. 



together with the paths of the incident and refracted rays, 

 A number of extremely interesting pictures were obtained 

 with the device, which proved to be the equivalent of a lens 



