ERRATA. 



Figure 20, page 54 and Fig. 21, page 56, for Range read Amplitude. 

 Table 21, page 55, last column, ,> 1° >, H". 



Figure 53, page 158, „ Fraimheim „ Framdrift. 



Page 268, line 11, „ contract „ contact. 



Page 268, line 37, „ above „ about. 



