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A Japanese police car with a PATLITE AWS light bar NEXCO East Japan patrol car with amber and red light bar. Red is the most used color on Japanese emergency vehicles. Japanese police use light bars mounted on a raised (mechanical) platform to make them more visible over congested streets. Rotating lights are most commonly used.
An illuminated Mars Light on an Amtrak EMD E8. Many railroads used Mars lights on a variety of locomotives, both steam and diesel. Mars Lights are no longer used by railways, having been replaced by ditch lights, with the exception of some passenger carriers, such as Chicago's Metra, which uses both Mars Lights and ditch lights on their equipment.
Spirograph is a geometric drawing device that produces mathematical roulette curves of the variety technically known as hypotrochoids and epitrochoids.The well-known toy version was developed by British engineer Denys Fisher and first sold in 1965.
The Code 39 specification defines 43 characters, consisting of uppercase letters (A through Z), numeric digits (0 through 9) and a number of special characters (-, ., $, /, +, %, and space ). An additional character (denoted '*') is used for both start and stop delimiters. Each character is composed of nine elements: five bars and four spaces.
Michael Faraday holding a piece of glass of the type he used to demonstrate the effect of magnetism on polarization of light, c. 1857.. By 1845, it was known through the work of Augustin-Jean Fresnel, Étienne-Louis Malus, and others that different materials are able to modify the direction of polarization of light when appropriately oriented, [4] making polarized light a very powerful tool to ...
Primary anti-tank mine. During the Gulf War, it was found to be highly resistant to mine ploughs, simply rotating under it to detonate below the vehicle, disabling some M60 tanks of the USMC after Iraq captured L9s from the Kuwaiti Army. [96] Bar mines have also been used as improvised demolition charges during operations Telic [97] and Herrick ...
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