3. Holmes began to reflect on what the
woman had said, as well as what he
saw in the letters Hosmer had written,
the detective sent a letter to Mr.
Windibank to summon him for the
same afternoon. Windibank arrived and
Sherlock explains some details about
the characteristics that make the
writing of each typewriter unique, and
states that both his letters and those of
the supposed "Hosmer Angel" have the
same characteristics, that is, they had
been written with the same machine.
3