Photography in Camp and IVoods 297 



It is well, if we are to depend upon the focus- 

 sing scale on these cameras, to test that scale when 

 we first buy one in order to be sure that it registers 

 correctly, else 

 we may find all 

 our results out 

 of focus and 

 fuzzy. This 

 can be readily 

 ascertained by 

 focussing upon 

 apiece of white 

 paper, with 

 heavy black 

 letters printed 

 upon it at the 

 different dis- 

 tance s, as 

 marked upon 

 the scale, and 

 noting if the 

 distance at 

 which a sharp 

 image is obtained corresponds to the figures upon 

 the scale. These scales are usually carefully tested 

 before leaving the factory, but occasionally one 

 is found that has been put on carelessly and is, 

 in consequence, out of register. Also, if we are 

 intending to rely to any extent upon the view 



Whipping a Mountain Stream. 

 Photograph by S. D. Dixon. 



