62 Telephone Systems of tJie Continent of Europe 



roof timbers and provided with an angle-iron frame carrying a 

 number of angle-iron arms. The second is also of wood, but 

 double, and supporting angle-iron arms of greater capacity. The 

 third, which is entirely of angle- iron, bears a strong resemblance 

 to, without being identical with, the Belgian design of standard, 

 which is not excelled anywhere for ability to withstand success- 



FIG. 12 



FIG. 



fully the many vicissitudes to which roof-supports of large capacity 

 are subject. Ground poles are usually of wood and in no wise 

 noteworthy for size or design ; but there are also a few iron columns 

 of the Ziirich type (see Swiss section, fig. 147). A few aerial cables 

 manufactured by Felten and Guilleaume are in use, but only in 

 special circumstances. In Munich, Nuremberg, and Landshut 

 there is some underground work, consisting partly of iron pipes, 



