Manufacturer/Model: Barr & Stroud 7X CF41, 7 X 50
Field of View: est. 7 deg = 123 m/1,000 m; APFOV 49 deg
Mar 16, 2011 Popular enquiries: Barr and Stroud binoculars. Serial numbers for binoculars were allocated in strict chronological sequence, irrespective of model. Vintage and antique binoculars,military,naval,army,zeiss and Dollond,barr & stroud. The only markings on these binoculars are a serial number R/86/AVL 479. Barr & Stroud Binoculars Barr and Stroud. Serial numbers for binoculars were allocated in strict chronological sequence, irrespective of model.
B&S Sahara Binoculars. The new Barr & Stroud Sierra Dual-Speed spotting scopes are possibly the. We distribute the Barr and Stroud range of optical products. 'I have Barr & Stroud Binoculars CF 40. 7x Serial no 10404 Other marks include AP No 1900A. Are you able to give any information about them.
Barr And Stroud Binoculars
Weight: 1570 gr
Exit Pupil: 7.14 mm
Serial #/Year of Manufacture: 69662 = manufactured in Glasgow in 1944/45 (lenses are not coated)
Notes: The Barr & Stroud CF41 was the standard British naval binocular during WWII entering service in 1935 as Admiralty Pattern 1900A and continued to be used as recently as the Falklands War, 1982 (see View 5: www.flickr.com/photos/binocwpg/7927306356/in/set-72157623..) .
The CF41 was derived from the civilian CF30 model and differs primarily in having an internal filter system. It is also considerably heavier having “watertight glands on all moving joints” (Barr & Stroud Booklet C.50) and unlike the CF30 could be filled with dry air to prevent condensation and fungus. Contrary to popular belief there is no evidence that the CF41 was ever nitrogen filled. During servicing a hand pump desiccator, a 25 kg apparatus which looked like bicycle tire pump, was attached to the desiccator connections, and the air inside the binocular was hand pumped from the binocular into the apparatus to a silica gel filled desiccator chamber which dried the air prior to its being pumped back into the binocular. The desiccator tubes inside the binocular for circulating the dry air can be seen in View 3: www.flickr.com/photos/binocwpg/4407463057/in/set-72157623.. .
As noted, the CF41 is internally fitted with selectable green, grey and yellow filters (see View 4: www.flickr.com/photos/binocwpg/4407390939/in/set-72157623.. ).
It has a Porro II design with prisms cemented together and the ocular field lens cemented to the prism surface to increase light transmission by reducing number of air/glass surfaces (see View 2 www.flickr.com/photos/binocwpg/4408162832/in/set-72157623.. ). A Porro II CF41 7X50 with the field lens cemented to the prism transmits approximately 16% more light than a standard Porro I 7X50 binocular with uncoated optics such as an early Zeiss Binoctar and led to the British Navy selecting this type as its primary handheld binocular during the late 1920's - 1930's.
Historically, it is notable that in May 1941 a CF41 used on board the HMS Suffolk first sighted the German warships which resulted in the sinking of the Bismark action.
The large yellow arrows on the barrels on the binocular denote government ownership and were placed there to prevent pilfering. Most British WWI and WWII binoculars had these arrows, but only Admiralty binoculars had painted yellow ones.
After cleaning binocular I found its view to be very pleasant and exceptionally bright for one with uncoated lenses.
For additional information about this model see 'Barr & Stroud 7X CF25 7X42 Left Compared to 7X CF41 7X50 Right: www.flickr.com/photos/binocwpg/4446418310/in/photolist-7L.. . And for more information about the British naval trials which selected this binocular see: www.flickr.com/photos/binocwpg/5714117906/in/photostream .
Download microsoft office 2013 15 0 4454 10027. Revised November 9, 2014
October 31, 2011 Update: I have so far seen CF41's in three movies. Vectric aspire 3 0 serial port. Not unexpectedly it appears in 'Sink the Bismark!' (1960) and 'The Longest Day' (1962). Most unexpectedly, Miss Marple played by Jane Rutherford can be seen wielding one in 'Murder Ahoy!' (1964).
Note: If you have a vintage binocular you either wish to sell or would just like some information about, I can be contacted at [email protected] .
Barr & Stroud Limited was a pioneering Glasgowoptical engineering firm. They played a leading role in the development of modern optics, including rangefinders, for the Royal Navy and for other branches of British Armed Forces during the 20th century. There was a non-military arm of the company which made medical equipment, like photocoagulators and electronic filters, some of which were used by the BBC. The company and its intellectual property passed through Pilkington group to Thales Optronics. The Barr and Stroud name was sold on to an importer of optical equipment who use the trademarked name for a line of binoculars and similar instruments.
Archibald Barr and William Stroud had been associated from as early as 1888 when the two men were professors of, respectively, engineering and physics at the Yorkshire College (now the University of Leeds). In 1891 they were approached by the Admiralty to submit a design for a short-base rangefinder for trial. By this time, Barr had returned to Scotland and taken the post of Regius Professor of Civil Engineering and Mechanics at the University of Glasgow. Although apart, Barr and Stroud kept in close touch and in 1892 they were awarded with a contract for six of their rangefinders.
In 1895, Barr & Stroud's Patents Ltd was renting workshop space near the university, at 250 Byres Road, Glasgow, but demand for the product soon necessitated a move to larger premises in Ashton Lane, Glasgow. By 1904, 100 men were working for the company in a new purpose-built factory in Anniesland, Glasgow designed by Campbell Douglas. Shortly thereafter, in 1909, Stroud resigned his chair at University of Leeds and moved to Glasgow to work for the company full-time. Barr, in spite of a distinguished teaching career at Glasgow University, followed his example in 1913. Together they formed Barr & Stroud Ltd. that year.
In 1914 they began extensions to the Anniesland works in order to meet the sharp increase in demand for their rangefinders that followed on the outbreak of the First World War. The war years saw the development of other products, including a torpedo depth recorder, a periscope rangefinder, fire-control systems and a dome sight for aircraft. During World War I there was a problem with the supply of binoculars to the armed forces and apart from the British makers, binoculars were bought in from various sources. So it was only natural that the military would be looking to rectify this problem. At the time Zeiss was probably the leading makers and the military thought this may cause a problem in the future.
It was c.1919 when the company started producing their first binoculars which were supplied to the British Navy and from then on the company continued to operate independently until c.1977 when they were taken over by the Pilkington Group. In 1992 operations moved from the original factory in Anniesland to a new plant in Linthouse on the site of the former Alexander Stephen and Sons shipyard. In 2000 the company became a subsidiary of the French company, Thales Group, and in 2001 Barr & Stroud Ltd became Thales Optronics Ltd.
The Barr and Stroud brand name was then bought by Eastleigh-based Optical Distribution Services Ltd who re-registered as Barr and Stroud Ltd in 2008. The new company has developed a new range of binoculars and telescopes. The new range of Barr & Stroud binoculars are currently made in China (Nov. 2011) and distributed by Optical Vision Ltd.
In the 1920s Barr & Stroud Ltd started offering sleeve valve motorcycle engines based on a design by Peter Burt and L.J. McCollum. In a half-page advert in Motor Cycle magazine in 1922 they encouraged readers to contact them at Anniesland, Glasgow, for more information, or contact the manufacturers currently offering their 350cc single cylinder engine, naming Beardmore-Precision, Royal Scot, Edmund and Diamond motorcycles. In 1923 a new motorcycle manufacturer, Grindlay-Peerless offered a 999cc V-twin Barr & Stroud engined motorcycle, later adding a 500cc and 350cc single. They also offered J.A.P. engines, and it appears the racing success of the J.A.P. engines made them the preferred choice, and so the sleeve valve engines were dropped in 1927.
Barr and Stroud constructed the first computer to be built in Scotland, the pioneering SOLIDACminicomputer for the University of Glasgow, assembled between 1958 and 1963 as an attempt to expand into electronics.
- ^Dictionary of Scottish Architects: Campbell Douglas[page needed]
- ^Archives of Barr and StroudArchived 30 March 2008 at the Wayback Machine
- ^'Image of barr and stroud motorcycle engine, 1923. by Science & Society Picture Library'. scienceandsociety.co.uk.
- ^Motor Cycle, 20 April 1922.
- ^RedLeg Interactive Media. '1924 Grindlay-Peerless 1000cc V-Twin - Classic Bike Guide - RealClassic.co.uk'. realclassic.co.uk. Archived from the original on 27 May 2013. Retrieved 19 March 2014.Cite uses deprecated parameter
- ^Thomas, Paul A. V. (1993). 'Solidac: An Early Minicomputer for Teaching Purposes'(PDF). IEEE Annals of the History of Computing. 15 (4): 79–83. doi:10.1109/85.238393. ISSN1058-6180. Retrieved 29 August 2014.
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