Question

1.What did Holmes do to be sure that Burnwell was the real culprit?
class 8 the adventure of beryl coronet
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Answer 1

Answer:

It is interesting to note that Conan Doyle chose to have Holmes use fingerprints but not Bertillonage (also called anthropometry), the system of identification invented by Alphonse Bertillon in Paris that pivoted on measuring 12 characteristics of the body. ... This observation leads Holmes to the culprit.

Answer 2

Answer:

To be sure that Burnwell was a real culprit Holmes observed the footprints as he was with only one leg so he matched the footprints, that night he saw a cut on the face of the man with the coronet and same cut was on the face of Burnwell.