 

  ,         ,     .         .       ,          ,    .

   25  1835        .      .    ,    .   ,     19      . 17  1848  ,    ,    .      13 . 

        ,   .      1  20   . ,    ,  .       .     2-   .          ,        - .           . 

      ,          '.    11  25   ,     13,50.              ,   ,     . 

 1855         ,      .     35 .                   . 

 4     .             Keystone Bridge Works.       1881 .

 1900      $40 .  1901             .  1910                  ,         . 

    83  11  1919 . 
