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An exchange of rubber for optical glass was proposed by Britain and Germany during the First World War. Optical glass was vital to the warfare of this era for binoculars and gunsights and rubber was needed for tyres and communications cables. Britain had sourced the majority of its pre-war optical glass from the German company of Carl Zeiss AG ...
An optical telegraph is a line of stations, typically towers, for the purpose of conveying textual information by means of visual signals (a form of optical communication). There are two main types of such systems; the semaphore telegraph which uses pivoted indicator arms and conveys information according to the direction the indicators point ...
The Army & Air Force Exchange Service (AAFES, also referred to as The Exchange and post exchange/PX or base exchange/BX) provides goods and services at U.S. Army and Air Force installations worldwide, operating department stores, convenience stores, restaurants, military clothing stores, theaters and more nationwide and in more than 30 countries and four U.S. territories.
A coincidence rangefinder or coincidence telemeter is a type of rangefinder that uses the principle of triangulation and an optical device to allow an operator to determine the distance to a visible object. There are subtypes split-image telemeter, inverted image, or double-image telemeter with different principles how two images in a single ...
Telegraphy is the long-distance transmission of messages where the sender uses symbolic codes, known to the recipient, rather than a physical exchange of an object bearing the message. Thus flag semaphore is a method of telegraphy, whereas pigeon post is not. Ancient signalling systems, although sometimes quite extensive and sophisticated as in ...
AN-6530 lenses are ground and polished optical glass, approximately ⁄32 of an inch (2.4 mm) thick. These share their design with B-7, Navy Mk-II and commercial 'Skyway' brand goggles. They were produced in clear, amber, green, and a high-density dark green for gunnery to facilitate spotting targets against the sun.
Rafael Advanced Defense Systems Ltd. (Hebrew: רפאל - מערכות לחימה מתקדמות בע"מ) is an Israeli defense technology company. It was founded as Israel's National R&D Defense Laboratory for the development of weapons and military technology within the Israeli Ministry of Defense; in 2002 it was incorporated as a limited company.
The heliograph was a simple but effective instrument for instantaneous optical communication over long distances during the late 19th and early 20th centuries. [2] Its main uses were military, survey and forest protection work. Heliographs were standard issue in the British and Australian armies until the 1960s, and were used by the Pakistani ...