Figure 18. — Soft-groind ruNNEUNG. The model of a 16-ceniury mine in 

 the Museum of History and Technology was constructed from illustrations 

 in such works as G. E. von Loh k, 1690, as well as 



the better known ones from I>> n Melallica. 



PAPER 41: TUNNEL ENGINEERING A MUSEUM TREATMENT 



219 



