APPENDIX. 633 



No. X. Explanation of the direction and inclination 

 of Feins. 



[See the Plate.] 



The position of metallic veins is ascertained and described 

 by three different angles -, that of the direction, dip, and 

 inclination. 



The angle of direction, or simply the direction, is ascer- 

 tained by observing the point of the compass, or degree of 

 the horizon, it tends towards, as A B, Fig. 1. 



The dip is the angle which it makes with the plane of the 

 horizon, as B A E, Fig. 2. 



The inclination is the angle which one of its sides makes 

 with a vertical plane, as a b c, Fig. 3 ; where b c repre- 

 sents the transverse section of the vein, and a b that of the 

 vertical plane. 



This is further illustrated by Fig. 4 ; where A B repre- 

 sents the perspective view of a metallic vein. C D is the 

 compass placed parallel to the horizon, and E F is the 

 direction of the vein. 



The angle F E B is the dip, being the angle which the 

 vein makes with the horizontal plane ; and the angle a b c 

 is the inclination, or the angle which the side of the vein 

 makes with the vertical plane a b. 



