Report of the judges of the Massachusetts Charitable Mechanic Association, on "Ridgway's revolving battery. Letters of Mrs. Ridgway and Admiral Davis, and Major King's report on the Ridgway battery. Letter of Admiral Davis asking for measures and weights, and engineer Wm. C. Hibbard's estimate thereofMassachusetts Charitable Mechanic Association. Board of Judges. · First published 1871Open the Tome
