1508 



Journal of Applied Microscopy 



LABORATORY PHOTOGRAPHY. 



Devoted to methods and apparatus for converting an object into an illustration. 



FURTHER NOTES ON THE USE OF THE TELEPHOTO LENS. 



In Volume IV, No. 4, of the Journal of Applied Microscopy, I gave an 

 illustration of the use of the telephoto lens in taking a nest from the top of a 

 dead pine tree. During the past summer I made further efforts to test the value 

 of a long focus lens, and give some of the results. 



My telephoto lens is fitted to a wide angle Zeiss Anastigmat, series IV. 

 The illustrations presented in this paper are from experiments on mountain 

 ranges and peaks, to be used geologically and physiographically. 



The Mission range is in western Montana, extending north and south for a 

 distance of about a hundred miles ; its western slopes are abrupt and craggy. 

 Many peaks in the range are unexplored, and few are named. The difficulties 

 one encounters in making a study of the range are many, and a complete study 

 has not yet been made. 



Fic;. 1. — View of a Portion of the Mission Range of Mountains in Western Montana. 



Fig. 1 is a portion of the southern end of the range, taken from a high hill 

 to the southwest of the range proper. 



The mountain indicated by A is McDonald peak, distance from the place 

 where the picture was taken about fifteen miles. The height is about ten thousand 

 feet, or about seven thousand above the village of St. Ignatius on the plain. 

 The negative was made early in June, with an orthochromatic plate and ray filter. 

 The atmosphere was clear, and the mountains are shown with much more than 

 ordinary distinctness. 



The mountain indicated by B is Sin-yale-a-min mountain, distance about ten 

 to twelve miles on an air line, with an elevation of 9"20(l feet. This mountain is 

 nearer than McDonald, owing to the position of the photographer with regard to 



