I also have a great grandfather who came to US on a ship named Jacob A Westervelt , described as a four-master, arriving in 1856? The story was that they ran into a storm which drove them back and caused a delayed arrival (New York) I have found info(I do not have the printed reference at hand but from memory) which refers to it running Liverpool-New York and based in the East River also another reference to a fire destroying it there. I , like you would love to find a photo or picture of the ship. A"cousin" in England has been unable to locate any such picture after inquiries there.