Ephraim Isaac
Ephraim was indirectly listed in the company roster in William Chipman's notebook under his father Jonathan Isaac.
More research is needed to confirm Ephraims's date of birth. The 1900 Census states that he was born September 1855 and other census records indicate that he was born sometime between 1854 and 1855. A possible entry in the "England and Wales, Civil Registration Birth Index," indicates that he was most likely born sometime between October and December 1855. Birth date listed reflects data from Family Tree at FamilySearch.org.
More research is also needed to prove death date.