Name of “Douglas Gamble”, year of birth, from the hand-drawn “Gamble Pedigree” tree received from Caroline Swart in an email dated 23 May 2018. Caroline is a x3-great granddaughter of Elizabeth Devis (b.1777). Brian of nzolivers.com is a x4-great grandson of Elizabeth’s brother, Henry Devis (b.1778).

Year and place of death from a paper titled, “The Gamble Family”, received from Caroline Swart in an email dated 23 May 2018:
“Cousin Phyllis Clarke recalls the death of Admiral Sir Douglas Gamble in 1934, born 1856…”
“… his career which was very distingushed they can only tell me that his father was Douglas Pitt Gamble”.
”Sir Douglas spent his retirement and died in the Isle of Wight”.

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Full date of birth, full date of death, second name of “Austin”, from this web page found by Brian of nzolivers.com:
http://www.dreadnoughtproject.org/tfs/index.php/Douglas_Austin_Gamble

Admiral Sir Douglas Austin Gamble, K.C.V.O., Royal Navy (8 November 1856 – 23 May 1934) was an officer of the Royal Navy.
Life & Career
Gamble was promoted to the rank of Lieutenant with seniority of 27 February, 1879.
Gamble was promoted to the rank of Commander on 1 January, 1893.
He proposed a method of night-time signalling in 1894 which he had personally tried in Malta in 1888 using models and 16 candlepower lamps [Diagram sketch on website]. He described the concept it in a section of the Annual Report of the Torpedo School in a description dated 24 July 1894. The scheme entailed use of an electric light situated under armour and casting its mirror-concentrated beam up the mast to be radiated outward by a cone at the military top. A signalman would work a shutter in the mid-point of the beam to flash the light, avoiding the risk of damage to wiring and the delay of filaments warming up or cooling down. Although Gamble proposed further testing, a subsequent report has not been found.
Captain
Gamble was promoted to the rank of Captain on 30 June, 1899.
In March 1902, Gamble assumed command of the second class protected cruiser Hyacinth.
He was appointed Captain of the armoured cruiser Kent in August 1903, staying in her perhaps until he took command of the battleship Canopus on 14 August, 1905. An accident in weighing anchor in November 1906 prompted a court of inquiry. It was determined that Captain Gamble was at fault in the matter.
Appointed Captain of H.M.S. Vernon on 10 May, 1907.
Flag Rank
Gamble was promoted to the rank of Rear-Admiral on 2 September, 1908.
On 3 February, 1911, cruisers Aboukir and Lancaster collided. Gamble was found to be at fault.
Gamble was promoted to the rank of Vice-Admiral on 8 December, 1913, vice Paget.
On 1 July, 1914, he was appointed Vice-Admiral in Command of the Fourth Battle Squadron, to be in Benbow when she was completed.
Captain of H.M.S. Beagle: 19 Nov, 1896
Captain of H.M.S. Hyacinth: 1 Mar, 1902 – 1 Apr, 1903
Captain of H.M.S. Kent: 1 Aug, 1903
Captain of H.M.S. Canopus: 14 Aug, 1905 – Apr, 1907
Captain of H.M.S. Vernon: 10 May, 1907
Rear-Admiral Commanding, Sixth Cruiser Squadron: 26 Sep, 1910 – 3 Jun, 1912
Vice-Admiral Commanding, Fourth Battle Squadron: 1 Jul, 1914 – 7 Feb, 1915