Barr & Stroud. IR18, Quality thermal imaging Barr & Stroud. Thermal scanner IR18 Barr & Stroud. IR18 thermal imager, In service Barr & Stroud.TOGS, Thermal observation gunnery sight Barr & Stroud. Periscopes and masts, Nuclear an diesel submarines Barr & Stroud. Submarine periscope retrofit Barr & Stroud/Ferranti. Thermal surveillanc system, Type 221 Barr & Stroud. Helicopter infra red system Barr & Stroud. IR18 mark II, Quality thermal imaging Barr & Stroud. ARG-4, Ultra-hard anti-reflection coating for germanium, Wiper-proof * weather-proof * wear-proof Barr & Stroud. Infra red telescopes Barr & Stroud. Reliability and maintainability engineering department, Product support group, Outline of services available on contract