Emerson and Baldwin appeared at the Pavilion Theatre in Newcastle in 1909 as this article from the Newcastle Weekly Journal & Courant, 30 January 1909 shows:
Not only are they considered “clever comedians” but they performed “some wonderfully smart and unique juggling feats”.
There’s some good biography of Eddie Emerson with some description of his act and relationship with Jerry Baldwin in this miracle factory article. It’s not explicit, but it appears that they’re Americans – so their appearances in North East England are obviously part of trips abroad.