Although the horse power is proportionately less than that of the _Invincibles_, the better lines of the ship have made her even more speedy. She easily exceeded her designed speed on trial, and has reached as high as 29.13 knots. The cost of construction was £1,547,426, which works out at about £82 10s. per ton, as against the average £120 per ton that the _Invincibles_ cost to build. She was the cheapest ship ever built for the British Navy,[33] to her date. Details of the _Indefatigable_ are:-- Displacement--19,200 tons. Length--578ft. Beam--79½ft. Draught--27¾ft. Guns--Eight 12-inch, fifty calibre, twenty 4-inch. Armour Belt--8-in. amidships, diminished to 4-in. at the ends. Machinery--Parsons Turbine. Horse-power--43,000 = 25 knots. Boilers--Babcock. Coal--(normal) 1,000 tons; (maximum) 2,500 tons; oil fuel also. Built at Devonport Dockyard. Engined by J. Brown & Co., of Clydebank. Two other battle-cruisers almost identical to the _Indefatigable_, the _Australia_ at Clydebank, for the Australian Navy, and the _New Zealand_ at Fairfield, a gift from New Zealand to the British Navy, were launched in 1911. The programme for 1908–09, consisting as it did of only two armoured ships, and the fact that the corresponding German programme was increased by one capital ship, bringing the total to four, brought the naval agitation to a head. Meetings demanding eight “Dreadnoughts” were held all over the country, with the result that the British programme for 1909–10 rose to four armoured ships with four other “conditional” ships. The ships of the former programme were the _Colossus_, _Hercules_, _Orion_, and _Lion_, and the first two of these were laid down some months before the usual date, the _Colossus_ being commenced in July instead of at the end of the year. The “conditional” ships were all eventually laid down in April of the following year. They were the _Monarch_, _Conqueror_, _Thunderer_, and _Princess Royal_. Under this programme there were no less than three distinct types of ships. The first two, the _Colossus_ and _Hercules_, are practically sisters of the _Neptune_, but of 400 tons greater displacement. They differ in appearance in having but one tripod mast instead of two. This, like the _Dreadnought’s_, is placed abaft the foremost funnel. The _Colossus_ was built and engined by the Scott Shipbuilding and Engineering Co., commenced in July, 1909, and completed two years later. The _Hercules_, built by Palmer’s, followed a month later in both cases. The first is fitted with Babcock, and the second with Yarrow boilers. A point of minor interest about these two ships is that whereas the anti-torpedo armament of the _Neptune_ is in three groups, that of the _Colossus_ and _Hercules_ is in two groups only, the mounting of small guns between the échelon turrets being done away with.