It looks like Charles Beattie Ewen is buried in Dalnottar Cemetery in Clydebank, in lair H76, which was purchased by his brother, William Cowie Ewen, who was a policeman in Balloch (at least, his address is given as Police Station, Balloch, so presume that was his job).
Images of the burial register are available on Ancestry, but if you're unable to view those, West Dunbartonshire Council should be able to confirm the details.
Ruth