l''>"0 Journal of Applied Microscopy 



By following up the creek along the canyon to the right, as shown in Fig. 2, 

 the position from which Fig. 4 was taken is found. The peak is the same 

 as shown in P^ig. 3, the direction of the peak being east of north. It was 

 several days after taking the negatives from which the first three figures were 

 taken. The peak is distant from the camera from five to seven miles. To 

 reach the summit from the position given in the illustration would require five 

 or six hours of stiff climbing. The wooded peak in the foreground, immediately 

 behind the small tree in the center, is a mile or more nearer than the main peak, 

 and is the end of the slope shown in Fig. 3. The day was bright and almost 

 cloudless, following a light rain. The sun was in the rear. The plate used was 

 an orthochromatic, with ray filter as usual. 



In Fig. 5 the telephoto was turned on the wooded ridge to the right of the 

 middle of Fig. 4, with the peak on the left. By one of those peculiar acci- 

 dents which often occur while exchanging plates under a blanket in the field, the 



Fig. 3. — A Portion of the Range shown in Fig. 1, indicated by B. 



plate was reversed in the camera, but the result is sufficient to show all that was 

 desired. The ridge to the right should be to the left. By a close examination 

 of Fig. 5, and comparison with Fig. 4, many details will appear in the former 

 not seen in the latter. 



The advantages of such photographs will be at once apparent to the reader. 

 It is possible to make out details of structure in mountain ranges without neces- 

 sarily making laborious climbs, and it is possible to make out details where ascent 

 is impossible. 



The difficulties in taking such photographs are not few. In mountainous 

 regions, where weight is a great consideration, it becomes necessary to carry a 

 small and light tripod. This is not sufficient for work with the telephoto, where 

 there must be great strength and rigidity in the tripod to prevent motion. The 

 days when wind is not blowing from some direction are not numerous while the 

 traveller is among mountain peaks. Long exposures are necessary, and a very 

 small vibration makes the result a failure. Another difficulty is that of getting a 

 satisfactory focus. The light coming through the lens from so small a portion 

 of the horizon is not great. The landscape on the ground glass is indistinct, 



