..f ~Re p 0 r t on the fa b r i c a t ion 0 f ir 0 n f 0 r d e fe n s i v e pur pos e s,

2 3 'X~ and its uses in modern fortifications, especially in works of coast 
defense. (38 Taf.) S u p pIe m e n t. (5 'l'af.) (In einem Bde.) 

8. Washington 1871-1872..