Log book kept as a Midshipman, successively on board HMS Revenge
, HMS Leander
and HMS Sutlej
, initially in home waters then sailing around South America and through the Pacific (including to Pitcairn Island, Tahiti, and Hawaii) illustrated with watercolour littorals, charts and engineering drawings, 2 March 1863 to 26 February 1865, c.200 pages, folio, stiff vellum boards ii.
Ship's Journal kept by Mainwaring successively on board HMS Leander
, including extensive periods spent in the Pacific, 5 June 1866 to 28 August 1873, 164 pages, large 4to, grey clothiii.
Printed "Clothes List" and "Slop list" ledger for crew under Mainwaring's command on HMS Immortalité
, c.60 pages, plus blanks, folio, 1872-73, grey cloth
Photograph album of life on board HMS Britannia
, including portraits of the royal cadets Prince Albert Victor Christian Edward (“Eddy”) and his younger brother Prince George (later George V), 8 photographs of them signed on the mount, plus a signed photograph of the princes' tutor, John Dalton, along with photographs of other cadets and officers, theatricals, sporting events, and views of the ship, in total approximately 170 photographs in an album, folio, labelled "Guy Mainwaring | H.M.S. Britannia", 1878-1881v.
Photograph of fourteen cadets and crew on HMS Britannia
's cutter, signed by the crew including Mainwaring and PRINCES EDWARD AND GEORGE, 210 x 285 mm, [23-24 July 1878], framed and glazed (420 x 485mm)vi.
Volume of press-cuttings relating to HMS Britannia
, chiefly from the Dartmouth and Brixham Chronicle
, March 1878 to May 1881vii.
Album kept by Mainwaring when commander of HMS Ganges
, including views of the ship, cadets in training, and Cornish views, 38 photographs in an album, oblong folio, green roan, 1886-1888, covers badly wornviii.
Notebook, with instructions on various aspects of naval seamanship, index, c.60 pages, plus blanks, folio, no date ix.
Photograph of Captain Guy Mainwaring R.N. (retired), 135 x 95mm, framed and glazed (255 x 300mm), labelled on the reverse, Aberdeen, 1897 x.
Pair of cufflinks, 18ct gold. London: Field & Beer, c.1880, with accompanying note stating that they were presented to Mainwaring by the Prince of Wales (later Edward VII) after his sons had left HMS Britannia xi.
Silver hunting horn presented to Mainwaring by the whips of the Britannia Beagle pack (founded by Mainwaring) xii.
Two seal matrices xiii.
Pocket chronometer by Henry Bright of Leamington given to Mainwaring by his father in 1860xiv.
Brass nameboard ('Captain Mainwaring/ Rickarton')xv.
Two watercolour portraits of Rear-Admiral Rowland Mainwaring (1783-1862), one c.1815, 200 x 150mm, framed and glazed (410 x 335mm) labelled on the reverse, the other mid-19th century, 200 x 150mm, framed and glazed (260 x 200mm) xvi.
Photograph of Mainwaring in sailor attire, framed and glazedxvii.
The New Testament. Cambridge, 1879
, with ownership inscription on front paste-down xiii.
Statham, E.P. The Story of The “Britannia”. London: Cassell and Company, 1904
[Gertrude Mainwaring, bookplate], with ephemera loosely insertedxix.
Whitmore Hall, 2 framed photographsxx.
Later family photograph album, mostly India, approximately 90 photographs, 1919-22xxii.
Henry Bosanquet, "Mainwairing, Sword and Dirk", typescript booklet, 14 pages, with accompanying note, 1957
housed in large ironbound naval trunk bearing Admiral Rowland Mainwaring's nameplate