Hello,
how interesting that you are a descendant of Elijah Mayer...
For my part, I am currently researching the Elijah Mayer pottery, as part of the collection of English black basalts here has several pieces signed "E.Mayer"... and came across your post here on Roots Chat.
Did you find any useful information from St. John's Church in Hanley?
Attached is a jpeg of a rough draft "family tree", created using dates obtained from various sources, as listed.
The information about the Mayer pottery business comes from Grant's book published in 1911 and Diana Edwards "Black Basalts" published by the ACC in 1994.