APPARATUS. 21 



down to the ground at some convenient spot, 

 if possible out of sight of the nest, and here 

 the bottom piece of wood is pegged down. The 



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ball is then put between the extended arms of 

 the lever, and the line passed round a little 

 pulley wheel, and made fast to the end of the 

 upper piece of wood. This done, the camera may 

 be worked from practically any distance, for on the 

 line being pulled the ball is compressed and the 

 shutter released. 



The line, especially when used alone, should be 

 of the thinnest, but strong, material, and of a dark 

 greyish-brown colour rather than black. A light 

 fly-line is just the thing, but it must not be of the 

 waterproof variety, as absence of gloss is even 

 more important than colour. It is surprising how 

 conspicuous a bright-surfaced line is in the sunshine. 



