Final specifications for 'Improvements in Side Propellors for Ocean and River Vessels'.; Patent Office Certificates of Leaving and Provisional Protection regarding 'A lifting Gallery applicable to Ships and Forts'.
Rough copy of final specifications for 'Improvements in Side Propellors for Ocean and River Vessels', n.d., by Captain Luke Thomas; and Patent Office Certificates of Leaving and Provisional Protection regarding 'A lifting Gallery applicable to Ships and Forts' both dated 21 April 1864 (Related Material SCS/1).