NON-BOAT: Pump with floating O ring for valve
plans set
SHIPS PLANSHerreshoff, L. Francis
5 sheets of plans for pump with floating O ring for valve, designed by L. Francis Herreshoff. Date of design is unknown. 4 sheets are duplicates.
SP.38.350
Mystic Seaport, Daniel S. Gregory Ships Plans Library, L. Francis Herreshoff Collection