166a 



The Berger Patent Mine Tachyineter. 



With Style I Patent Intcrrlianvpahlc Auxiliary TI-!CM-I.|,,- 



See Mining Transits, sizes 4 and 6, pages 108 and ibj. For price c>f instt-min-nt and extras j 



ibo and 162. 



Fig. i. General arrangement of instrument showing upright post for auxiliary 

 attached to object-: 



Fig. 2. Interchangeable auxiliary telescope : Fi.ir. 7 its counter]' 



Fig. 3. Auxiliary telescope at side when measuring vertical an.ules also fur making latitude obs- 

 page io,S), when sun is too hi.u'h for observations \\ith the inaii. 



Fig. 4. Auxiliary telescope attached to vertical post for u M horizontal 



angles and when surface or meridian lines must be carried down a sh.it t \\hen objr< ts cannot 

 by main telescope, as well as for time observations \\hen sun is too hi.iji Im- ob-.. rvation with the 

 main telest ope. 



Fig. 5. Side telescope placed parallel with the main telescope in emer.yi-m i< s by mraiv; f the striding level 

 (which is furnished only when the solar equatorial adapter is ordered), obviating tin- 

 plating both lines of sight parallel by bisecting an object ; also showing manner <if (enterii. 

 point above. 



Fig. 6. Patent short focus lens attached to main telescope, p. 118. 



Fig. 8. Patent Disappearing cross and stadia wires ; inclined wires indicating center for stadia wires, p. 81. 

 (In most cases obviated by arrangement of wires as shown on page 164.) 



Fig. 9. Leather case with shoulder straps. For price see page 162. 



