Search results
Results from the WOW.Com Content Network
Pyrotechnics is the science and craft of creating such things as fireworks, safety matches, oxygen candles, explosive bolts and other fasteners, parts of automotive airbags, as well as gas-pressure blasting in mining, quarrying, and demolition.
Adding 2% of its weight with boric acid is reputed to significantly increase stability and shelf life, through resistance to dampening through ambient humidity. Other ratios such as 6 KNO 3 /3 Al/1 S and 5 KNO 3 /2 Al/3 S also exist and work. All ratios have similar burn times and strength, although 5 KNO 3 /3 Al/2 S seems to be dominant.
The elytra of this cockchafer beetle are readily distinguished from the transparent hindwings.. An elytron (/ ˈ ɛ l ɪ t r ɒ n /; from Ancient Greek ἔλυτρον (élutron) 'sheath, cover'; pl.: elytra, / ˈ ɛ l ɪ t r ə /) [1] [2] is a modified, hardened forewing of beetles (Coleoptera), though a few of the true bugs such as the family Schizopteridae are extremely similar; in true ...
Black snakes are a popular firework in India, which children play with during the festival of Diwali. Though deemed toxic by the Chest Research foundation and Pune University, black snake fireworks are still in use. The objective of the study was to determine which firework produced the most air pollution in India.
The Siege and Destruction of Jerusalem by the Romans Under the Command of Titus, A.D. 70, by David Roberts (1850), shows the city burning. Early thermal weapons, which used heat or burning action to destroy or damage enemy personnel, fortifications or territories, were employed in warfare during the classical and medieval periods (approximately the 8th century BC until the mid-16th century AD).
An illustration of a fireworks display from the 1628–1643 edition of the Ming Dynasty novel Jin Ping Mei [2] An etching of the Royal Fireworks display on the Thames, London, England, in 1749 An 18th-century illustration of Chinese fireworks from an English abstract of an account of China by French Jesuit Pierre Nicolas d'Incarville [3] A ...
A pyrotechnic composition is a substance or mixture of substances designed to produce an effect by heat, light, sound, gas/smoke or a combination of these, as a result of non-detonative self-sustaining exothermic chemical reactions.
Later, M-80s were manufactured as consumer fireworks made from a small cardboard tube, often red, approximately 1 + 1 ⁄ 2 inches (3.8 cm) long and 9 ⁄ 16 inch (1.4 cm) inside diameter, with a fuse coming out of the side; this type of fuse is commonly known as cannon fuse or Visco fuse, after a company responsible for standardizing the product.