Tent and Camera 



69 



marks on all such shutters, which are conventional rather than 

 exact time measurements, differ in different shutters of the 

 same or different make, and their limit of rapidity does not 



Fig. 44. Female Brown Thrush stepping into her nest to brood. 



exceed "y^ second." For greater speeds the focal-plane or 

 some other very rapid shutter must be used. 



Plates. For animal photography the most rapid plates are 

 none too fast, and any of the best brands can be recommended. 



