which housed an Schwarzlose M.07/12 anti-aircraft machine gun. Szent István had a few external variations from the other ships of her class. These differences included a platform built around the fore funnel which extended from the bridge of the ship to the after funnel upon which several searchlights were installed. A further distinguishing feature was the modified ventilator trunk in front of the mainmast. The rangefinders on Szent István had an armored stand which turned 90° to the right of those on the other three ships. This was done in order to present a smaller target for the ship's broadside. Perhaps the most-notable distinguishing characteristic of Szent István was that she was the only ship of her class not to be fitted with torpedo nets. The other three ships of the Tegetthoff class had their torpedo nets removed in June 1917. The Tegetthoff-class ships were manned by a crew of 1,087 officers and men. Propulsion Differences between the three battleships constructed in Trieste and the one in Fiume were most apparent when examining each ship's propulsion. Szent István differed from the other ships in that she possessed two propellers and two larger Parsons steam turbines, while the propulsion of Viribus Unitis, Tegetthoff, and Prinz Eugen each had four smaller Siemens turbines and four propellers. These turbines were housed in a separate engine-room and with the exception of SMS Szent István, they were powered by twelve Yarrow boilers. The more modern new type of Babcock & Wilcox boilers of Szent István were 48 tonnes heavier than the older type Yarrow boilers installed on the sister ships, however they were more efficient than the old boilers. The new Babcock & Wilcox boilers had a huge advantage of being able to maintain top speed for up to eight hours, compared with only two hours on their sister ships. They were designed to produce a total of , which was theoretically enough to attain a maximum designed speed of . While it was reported during the speed trials of Tegetthoff that she attained a top speed of , the actual top speed of the Tegetthoff-class ships is unknown as the sea trial data and records for each ship were lost after the war. Each ship also carried of coal, and an additional of fuel oil that was to be sprayed on the coal to increase its burn rate. At full capacity, the Tegetthoffs could