Narrowband interference filter, one of five, type MD4 (peaks at the wavelengths 436, 546, 626, 672, and 766 n.m.), by Barr Barr and Stroud Ltd., Glasgow, Scotland, 1973. Narrowband interference filter 1973
Narrowband interference filter, one of five, type MD4 (peaks at the wavelengths 436, 546, 626, 672, and 766 n.m.), by Barr Barr and Stroud Ltd., Glasgow, Scotland, 1973. Narrowband interference filter 1973
Manually-operated cassette changer for cerebral angiography complete with ten cassettes, by Barr and Stroud Ltd., Glasgow, 1960s Manually-operated cassette changer for cerebral angiography complete with ten cassettes 1960-1970
Specimens showing stages in cutting an optical glass prism Specimens showing stages in cutting an optical prism
Binocular bifocal periscope, type CK.11, number 282, made by Barr & Stroud Ltd. Binocular bifocal periscope
Barr and Stroud Range finder, infantry no. 2 patent 1462 (1903), c. 1914, originally the property of C.L. redding, head of optics department, Northampton Polytechnic Barr and Stroud Range finder
Narrowband interference filter, one of five, type MD4 (peaks at the wavelengths 436, 546, 626, 672, and 766 n.m.), by Barr Barr and Stroud Ltd., Glasgow, Scotland, 1973. Narrowband interference filter 1973
PHOTONYMOGRAPH MoS Type PN4 (For Map Symbols and Lettering) by Barr & Stroud, UK, 1958, complete with Accessories, two cases of Letter Discs, and Documentation PHOTONYMOGRAPH MoS Type PN4 (For Map Symbols and Lettering) by Barr & Stroud 1958
Binocular bifocal periscope, type CK. 11 number 272, made by Barr and Stroud Ltd, comprising the following four parts Binocular bifocal periscope