850 



SEC. 16. GEOLOGY AND MINING. 



Alpine Club Map of Switzerland ; two base lines from globe, east coast 

 of Sardinia and south-east coast of Red Sea. 



Jukes's geological map of Ireland ; base line, eastern coast of Adriatic. 



The base lines are portions of great circles having the directions of, and 

 passing along, the coast lines indicated, and have been transferred from the 

 globe. 



3326. Globe mounted for the study and demonstration of the 

 angular relations of directions presented by lodes, dykes, lines of 

 dislocation, mountain chains, coast lines, and river valleys. 



Jos. P. O'Reilly. 



This globe allows of the tracing of great circles through given points, with 

 great facility and rapidity. These great circles can be transferred to maps, 

 and serve as bases of comparison for the lode systems of mining districts, and 

 in general for all geological lines of direction. 



The above was designed by the exhibitor in 1874, and used for public 

 lectures. A similarly mounted globe was shown in Paris at the Geographical 

 Exhibition of 1875, by M. Chancourtois. 



3327. Portable Apparatus, for preparing Sections of rocks, 

 minerals, fossils, &c., for microscopic examination. 



3328. Specimens of Sections 



machine. 



F. G. Cuttell. 



prepared with the above 

 F. G. Cuttell. 



3328. Lapidary Apparatus for slitting, grinding, and polish- 

 ing rocks, pebbles, fossils, &c., especially adapted for the 



