Dreadnought, and the British ships which immediately followed it, carried five turrets: one forward, one aft and one amidships on the centreline of the ship, and two in the 'wings' next to the superstructure.
One standard target was vertically placed on the road surface in the middle of two poles, and in the centreline of the lane in the position that is shown in Fig. 1.
Another variation of the propulsor involves the application of two concentric propellers on the same centreline, driven by the same prime mover through a gearbox that causes each propeller to rotate in a direction opposite the other.
Stowage was accomplished by elevator lifts, which were usually located in two or three places along the centreline of the flight deck.
Her main armament consisted of six BL 9.2-inch Mk X guns in single turrets, two on the centreline and two on each beam, giving a broadside of four 9.2 in guns.
Three turrets were located conventionally along the centreline of the ship, with the forward turret ('A') and two aft turrets ('X' and 'Y'), the latter pair separated by the torpedo control tower located on a short tripod mast.
The ground equipment of the ILS consists of two directional transmitters that send out radio beams, sometimes of microwave frequencies (i.e., frequencies of more than 1,000 MHz), from either side of the runway's centreline.
The two techniques are applied simultaneously in a vertical plane through the centreline of the investigated pipe flow, illuminated by a single laser-sheet in a time-resolved manner (at a frequency of 1 2 kHz depending on the flow condition).
By April 1940, the ship had been rearmed with two QF Mk V 4-inch anti-aircraft guns on her quarterdeck, as well as three quadruple Vickers.50 machine gun mounts; one of these was on each side of her hull and the third was on the centreline of the quarterdeck.
Most of the original Pilates exercises entailed forward and backward motion along the centreline of the body.
