1885 Apr 23. birth at Acton , Middlesex, the son of Spencer Collison Blackett, an army officer.
He was educated by private tutor and abroad
1891 census at Stone, Kent
1911 census at 4 Montpelier Road, Twickenham
1915 Feb 19, Hampshire (Carabiniers). Arthur Tyrrell Blackett to be Second Lieutenant.
1916 Jul 20 joined the 190th Brigade of the 63rd Division in France
1917 Jul 1. Promoted Lt
1919 Feb 18 . 4th Beds Regt. Lt. A. T. Blackett to be actg. Capt. whilst comdg. a Co.
1919 Apr 30 relinquishes the Acting rank of Capt
1920 Apr 1 Resigns his commission 4th Bedf. and Herts. B.—Lt . A. T. Blackett, and retains the rank of Lt.
1922 Jan 4 A British Gendarmerie office headed by a newly appointed temporary adjutant, Captain A. Tyrell Blackett, was opened in the air ministry head-quarters, Adastral House on Kingsway, London, to administer the recruitment process.
Gannon writes that Captain Blackett, Major John Kershaw, Major Hallowell Carew, and Lt. John Bockett, were recruited from RIC intelligence,
1922 Mar 21 . enlisted in Palestine Gendarmerie as a Captain
1922 Feb 21 in Blue Book as Deputy Supt at Jerusalem, Arthur Tyrrell Blackett
1932 he was a Deputy Superintendent in Palestine
1934 Aug 20. died Jerusalem
