Clerke 's collections were left to Joseph Banks following Clerke 's death on Cook 's third voyage .
It is speculated that this helmet may have belonged to Cook 's second in command , Charles Clerke .
Charles Clerke 's collections were left to Joseph Banks following Charles Clerke 's death on Cook 's third voyage .
It is speculated that this helmet may have belonged to Cook 's second in command , Charles Clerke .