302 



MINING 



at 70 fathoms below the adit-level. As the inclination of the lode then alters, the 

 shaft is continued on the lodes. An- 

 other fissure or lode, sometimes called 

 a ' dropper,' is seen to take nearly a 



vertical direction from the 50-fathom 

 level, and from the shafts levels are 

 driven into this lode, at about every 10 

 fathoms. 



Fig. 1452 represents in plan the un- 

 derground workings of a Cornish mine. 

 Those who are not familiar with mining 

 are requested to suppose that the earth 

 is transparent so as to enable us to see 

 the lewis worked at various depths, from 

 the adit-level through which the water 

 pumped from the mine is discharged 

 to the 125-fathom level below it. 

 These levels are numbered in the plan. 

 They are not worked immediately under 

 one another; but, as the lode inclines, 

 in the same way as is shown in the 

 Gaunter lode (fig. 1450), they follow in 

 position this underlie of the lode. Tho 

 dark lines and the dotted lines crossing 

 the numbered lodes, are workings upon 

 lodes, running in a contrary direction 

 to the lode principally shown. This 

 plan shows the junction of the granite 

 with the killas or clay-slate of Corn- 



