165b 



Fig. 10. Style I, auxiliary telescope 

 with striding level mounted 

 on solar equatorial adapter 

 when making meridian obser- 

 vations (page 1 68). During 

 observations striding level is ' 

 removed. 



Fig. n. Patented Adjustable and Dust 

 Proof Glass Protected Edge 

 graduation for the vertical 

 circle. 



Fig. 12. Plumbing Device A and B for 

 carrying a meridian or surface 

 line down a shaft by the plumb 

 line method.* Fig. 14. 



Fig. 13. Patented Lateral Adjuster for 

 moving Transit quickly and ac- 

 curately on to line given ty the 

 plumb wires A and B down in 

 a shaft ; or also in juiface 

 alignment work. First rzrge 

 into line approximately ty lifflt- 

 ing center; next level up <aie- 

 fully ; then move exactly on to 

 line" by lateral adjuster, vhich 

 does not disturb the position 

 of the spirit levels. 



* For valuable suggestions in earning 

 out the perfection of this device we are 

 indebted to Mr. G. H. Potter, M. E., 

 of Butte, Mont., and Mr. E. E. 

 Young, C. E., Boston, Mass. 



13 



VEflim SECTION 1HBDUGH SHAFT 

 14 



The Berger Patent Mine Tachynieter. 



(Continuation.) 



