Ok then, maybe this will clear it up a bit.
350 rounds per gun, contained within the turret, and 24 seconds of firing time.
Another very useful item of equipment designed and produced by Rose Brothers was the oxygen economiser. Oxygen was stored under pressure in the aircraft in metal cylinders and when in use quite a lot went to waste, the only part used being that breathed in by the crew member. The economiser was a rectangular container containing about the amount of oxygen needed for one breath. It filled, then a valve closed off the supply and only opened after the crew member had emptied it by breathing in, via his oxygen mask.
Sir Arthur Harris was quoted as saying – "Later in the war, Roses, that is Alfred Rose himself, Curtis the designer and Fred the foreman – were again to pull us out of the soup with a beautifully designed and made 0.5inch turret" – this was the famous "Rose Turret", an example of which can be seen at the Royal Aircraft Museum at Hendon. A slightly different version of the story suggests that Air Vice-Marshal Sir Edward Rice and Alfred Rose collaborated on the design of the new turret. "Despite a lack of official interest", Rice went ahead and helped Rose with the winning design, the Air Ministry placing an initial production order for the turret in June 1943. Work had started on the design and development of the turret on late 1943/early 1944. Production began in 1944 after a few prototypes had been tested and modified, mainly to eliminate vibration. Ten turrets were produced by June 1944 after which production was steadily improved. Although over seven thousand Lancaster bombers were built during the war, most were equipped with Frazer-Nash hydraulically operated tail turrets, fitted with four .303 calibre machine guns. Only four hundred were fitted with Rose turrets. This might not seem many but it was a fantastic achievement in such a short time, especially by a firm that, prior to the war, had not been involved in this type of work. . Rose Brothers developed a strong relationship with the personnel of RAF Hemswell (just east of Gainsborough and 14.5 miles north of Lincoln) and it was here that the Rose turret was fitted to the Lancasters of No 1 Group, Bomber Command, in November 1944. Rose Brothers developed a strong relationship with the personnel of RAF Hemswell (just east of Gainsborough and 14.5 miles north of Lincoln) and it was here that the Rose turret was fitted to the Lancasters of No 1 Group, Bomber Command, in November 1944.
The men and women who built the Rose Turret. Photograph taken at Gainsborough on 6th March 1945.
The Rose Turret fitted to a Lancaster bomber.
The turret contained twin mounted 0.5" Browning Automatic machine guns, three hundred and fifty rounds per gun, with an effective range of six hundred and fifty yards. The heavy guns were for daylight use, as the limited visibility at night made their longer range ineffective compared to the more rapid fire of the .303 Brownings. The heavy guns were for daylight use, as the limited visibility at night made their longer range ineffective compared to the more rapid fire of the .303 Brownings. It used a Barr Stroud Mk IIIA reflector sight with a traverse of +/- 94 degrees, elevation 49 degrees and a depression of 59 degrees and allowed for a total firing time of 24 seconds, compared with the 130 seconds firing time for the four-gun Frazer-Nash turret). It was fully hydraulically operated, and therefore easily manoeuvrable, Should the plane be damaged and the order to bale out given, all the rear gunner had to do was to fall through the hole in which his gun manoeuvred. This in itself saved many lives. Ted Beswick of the heavy machine shop at Gainsborough flew in a Rose turret as rear gunner -
"It had more room than in other types and it was possible to wear a back type parachute and so bale out of the turret. It was, however, very cold due to the cut-away Perspex, which left the turret completely open. This made for better vision but it was necessary to wear four pairs of gloves. One also had to be careful when entering the turret not to catch one of the control rods with the right foot, causing turret rotation. The turret was controlled by grasping a control box with both hands (this was about four inches square and set at about eye level) and also carried the reflector sight and firing button. By moving the control to the left, the turret swung to the left, and so on. Ammunition was stored in side the rear of the turret in tanks. In other makes of rear turret, the ammunition was stored in the fuselage and fed via the bottom of the turret.
In front of the turret was another knob which could be used to rotate the turret, known as the search lever. It was used when searching for fighters, as this was less tiring than stretching up all the time operating both the guns and the turret. The turret could also be operated by hand if motors or hydraulics failed".
Lancaster bomber
A key part of the Rose turret mechanism was the valve chest. This facilitated a rapid change in the direction that the guns pointed by instantly altering the flow of oil in the hydraulic system. The turret and guns were lined up instantly wherever the sights were pointed. The gun turrets were tested at the Rose factory and some of the men who worked on these guns also installed them in the aircraft.
The Rose turret was only used by Nos. 83, 101, 153 and 170 Squadrons of No. 1 Bomber Group from the middle of 1944 onwards. Frazer-Nash later developed the F.N.82 turret which was also fitted with twin 12.7 mm (0.50 in) Browning machine-guns and equipped the Lancaster Mk VII.
Letter to Alfred Rose from Air Chief Marshal Sir Arthur "Bomber" Harris, dated 19th June 1945. The final part of the letter is particularly telling – " ------what is easily the best turret to date. Furthermore it is the only turret from which gunners can escape, if they have to abandon the aircraft, with any real chance of getting away with it, and we have had several Rose turret occupants back as the sole survivors of crews ------ ".
It is believed that Rose also supplied hand-operated dorsal turret gun mountings for a small number of "special transport" (troop carrying) versions of the Armstrong Whitworth Albemarle medium bomber that were transferred to the Soviet Union in 1943/44.
Rose's links with RAF Scampton were almost as close as with RAF Hemswell and Guy Gibson, Leonard Cheshire and others were frequent visitors to the Albion Works. Gainsborough also made parts for the Lancasters that carried out the Dam Buster raid. The story of this is told in length by Augustus Muir in his chapter on "Equipping the Services". After the raid, Gainsborough was visited by Guy Gibson and a number of the aircrew, complete with their new medals.
(Of the 133 aircrew who went on the raid, 53 were killed and three bailed out to be made POWs. Of the surviving aircrew thirty-three were decorated at Buckingham Palace on 22 June, with Wing Commander Gibson awarded the Victoria Cross. In total there was one VC, five DSOs, ten DFCs and four bars, twelve DFMs and two CGMs).
Augustus Muir also tells the remarkable story of how Alfred Rose responded to an unexpected request from the Air Ministry, the result of which was that, in a new 'dispersed' factory in the village of Saxilby the site for which was found, buildings erected, machinery put in, electricity, water supplies and drainage laid on and roads built, all within little more than 30 weeks – a new navigation instrument,an air position indicator that allowed navigators to read off their positioning degrees and minutes, described as "the most efficient type then in use", was produced.
This device continued to be made at Saxilby after the war. Mrs Plummer, who had joined the company at its opening in April 1943, was responsible for the welfare of the well over 100 women who worked in the factory when it was on full production. Finding digs for them all in Saxilby was quite a task.
This illustration is of what is believed to be the type of instrument for which Saxilby was first set up to manufacture. Eric Foxley has kindly given permission to use this image from his website. We understand that the instrument now resides at Bletchley Park (of Enigma code-breaking fame).
This unit is from UK wartime aircraft, and computed an aircraft's latitude and longitude using an entirely mechanical (analogue) process, involving integration, sines and cosines. The current speed and direction were fed in on servo-motors on the right of this photograph. The speed was split mechanically into sine and cosine components for latitude and longitude changes, and integrated to give the current position. The longitude calculation also needed an inverse "cosine" component (longitude changes more quickly nearer the poles proportional to the cosine of the latitude). The mechanical process would, of course, have failed near the north or south poles.