Friction-lights

Ref 4). Its Nitrate added in small portions to coned H2S04 gave a fine wh ppt which, after washing with 4 portions of w and air drying at RT, exploded violently. It was also exploded by friction light impact. When heated, decompd with evolution of gas (Ref 3)... 

Organic peroxides have the general structure R-O-O-R, where R and/or R are organic substituents. These compounds are very unstable and may self-react in a violent explosion when triggered by heat, impact, friction, light, or vibration. Benzoyl peroxide and other organic peroxides should not be present in high school chemistry labs. 

Explosion or sensitization to explosion can be caused by shock, friction, light, ultrasonic... 

Explosion heating, friction, light and contact with many substances can cause explosion. do not subject to shocks or friction. in case of fire keep tanks/drums cool by spraying with water, but DO NOT spr substarrce with water, fight fire from protected location. 

The first inventor of Friction Lights (as he called them) was undoubtedly John Walker [1781-1857], of Stockton-on-Tees, who in 1825 compounded a percussion powder of equal parts by weight of potassium chlorate and antimony sulphide such mixture (made into a paste with gum) was afterwards used for the tips of Friction Lights made and sold by him from 7th April, 1827, onwards, as recorded in his Day-Book. The head of the match, on a wooden splint, was pressed in a fold of sand-paper and forcibly drawn out. Such matches, called lucifers and struck on sand-paper, were patented in 1832 by Samuel Jones in London. Wiggers reproduced them with a composition of 2 drachms of chlorate, i scruple of antimony sulphide, drachm of animal glue, and water to make a thin paste. 

Between about 1780 and 1850 a variety of fire-making devices were invented. The pyrophoric properties of white phosphorus were utilised in the earliest form of matches, which consisted of strips of paper tipped with the element and sealed in glass tubes. When broken, the paper would catch fire. The first striking matches ( friction lights ) were invented by J. Walker of England in 1826, but these did not contain phosphorus. Shortly afterwards a great improvement was achieved by C. Sauria of France who incorporated white P in the formulation. 

Foam rheology has been a challenging area of research of interest for the yield behavior and stick-slip flow behavior (see the review by Kraynik [229]). Recent studies by Durian and co-workers combine simulations [230] and a dynamic light scattering technique suited to turbid systems [231], diffusing wave spectroscopy (DWS), to characterize coarsening and shear-induced rearrangements in foams. The dynamics follow stick-slip behavior similar to that found in earthquake faults and friction (see Section XU-2D). 

This invention relates generally to light weight covers used to increase the aerodynamic properties of wheels. More specifically, the present invention relates to covers for wheels capable of creating an aerodynamic effect by reducing the friction or drag across the surface of a wheel created by air flow. 

User-Related Properties. The most important element in the player s contact with the surface is traction. Shoe traction for light-duty consumer purposes need address only provision of reasonable footing. The frictional characteristics are obviously of much greater importance in surfaces designed for athletic use. For specialized surfaces such as a track, shoe traction is especially critical. With grass-like surfaces, traction is significantly affected by pile density and height, and other aspects of fabric constmction. 

Because of the steep pitch required, slides are limited in application. They are most commonly used to bridge the gap between roller-conveyor systems on two floors, because the roller conveyor can take the container off the slide rapidly and ehminate or reduce the chance for collisions. Slides may also be used when containers can be chuted from an upper floor to a manually loaded carrier. The use of several rollers at the feed point is recommended for easy dehveiy to the sloping section. If the drop is short and containers light, a roller cleanout will prevent backup of containers on the slide. The slope of gravity slides is a function of container weight, size, and friction characteristics and should be selected with care to be sure that containers do not move either too swiftly or not at all. Slides usually use flat steel sheet. 

No light metal such as aluminium is used as an external surface to avoid frictional arcing. 

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