Each sail had twelve bays with three shutters per bay, giving a total of 288 shutters, each carved with a number in Roman numerals to indicate its location. The weather on the sails was 23˚ at the heel and almost 0˚ at the tip. Machinery The Upright Shaft is wooden, in two sections for reasons noted above. It is twelve sided, across the flats and long in total. The Wallower is of compass arm construction, diameter with 43 cogs. At the bottom of the Upright shaft the diameter compass arm Great Spur Wheel has 126 cogs. It drives four pairs of underdrift millstones via stone nuts with 24 cogs. The millstones are three pairs of French Burr stones and one pair of Peak stones. Two pairs of the French Burr stones are diameter and the other two pairs of millstones are diameter. Steam engine The steam engine was located in a brick building built against the north-east side of the windmill, and drove two pairs of millstones, a centrifugal governor, and a sack hoist. The steam driven millstones were located on 2 levels and driven by a square shaft of length, those on the upper floor being driven by a cast-iron bevel wheel with wooden cog inserts. It was also able to work various dressing machines in the windmill, but not the wind driven stones. There is some difference over the exact type of engine, it being variously described as a grasshopper engine built by Napiers, and a Cornish boiler by Davey Paxman & Co. Both sources agree that the engine had formerly been used in a Thames steamboat. The steam engine itself was removed in 1940 and taken to South West Essex Technical College in Walthamstow, while the building and remaining contents were removed in 1960 with two of the millstones remaining at the windmill entrance. Millers James Nokes 1803–1838 Thomas Nokes 1838–1849 Thomas Abraham 1857–1882 John Arkell Abraham 1882–1912 Thomas, Alfred and Clement Abraham 1912–1934 References for above:- Location The mill is located in a small open space maintained by Havering Council, known as Windmill Field on St Mary's Lane. The nearest tube stations are Upminster Bridge tube station and Upminster station. Views from the top of the windmill include Canary Wharf and the transmitter at Crystal Palace. References External links Havering London Borough Council website history of the windmill Windmill World webpage on Abraham's Mill Photos of