A 12x10 negative. A starboard bow view, taken from wide off the bow, of the spritsail rigged general cargo topsail barge Shamrock (1899) under sail during a Thames or Medway Barge Match, probably the 1900 Thames match. Her crew are in whites and she has flag number 1 on her forestay. She is running downwind on the starboard tack and her jib is poled out. A vertical format image.