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Green Man (PGI)
The Green Man is a figure associated with the Pyrotechnics Guild International (PGI). He appears on the Guild's emblem and was selected from John Bate's 1635 fireworks treatise ''The Second Booke'', to symbolize the long tradition of using fireworks as a part of festivals and celebrations - at that time led by so-called "Green Men" appointed to head processions with a "Fire Club" shooting sparks. They were called Green Men because they clothed themselves with fresh leaves to protect themselves from sparks produced by their hand-held fireworks. This gave rise to the traditional salutation "stay green" amongst those involved with fireworks. See also * Pyrotechnics Guild International The Pyrotechnics Guild International or PGI founded in 1969 is an independent worldwide nonprofit organization of amateur and professional fireworks enthusiasts. Its membership is the largest pyrotechnic community in the world. The Guild has a yea ... References External links * {{official web ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Second Booke
The second (symbol: s) is the unit of time in the International System of Units (SI), historically defined as of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each (24 × 60 × 60 = 86400). The current and formal definition in the International System of Units ( SI) is more precise:The second ..is defined by taking the fixed numerical value of the caesium frequency, Δ''ν''Cs, the unperturbed ground-state hyperfine transition frequency of the caesium 133 atom, to be when expressed in the unit Hz, which is equal to s−1. This current definition was adopted in 1967 when it became feasible to define the second based on fundamental properties of nature with caesium clocks. Because the speed of Earth's rotation varies and is slowing ever so slightly, a leap second is added at irregular intervals to civil time to keep clocks in sync with Earth's rotation. Uses Analog clocks and watches often have ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pyrotechnics Guild International
The Pyrotechnics Guild International or PGI founded in 1969 is an independent worldwide nonprofit organization of amateur and professional fireworks enthusiasts. Its membership is the largest pyrotechnic community in the world. The Guild has a yearly convention. People from all over the world come to this event that lasts for about a week. Educational and scientific purposes The PGI strives to promote the safe and responsible display and use of pyrotechnics and fireworks. Fireworks display operator training is offered, as well as classes on specific safety and legality issues. The PGI was founded by Max P. Vanderhorck a former meteorologist from San Diego California fueled by his love for fireworks and the preservation of what seemed (at the time) like a dying American Tradition. The PGI encourages the display of public and private fireworks in conjunction with local and national holidays as well as patriotic and other events. Fireworks are a part of our heritage, and only thro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fireworks
Fireworks are a class of Explosive, low explosive Pyrotechnics, pyrotechnic devices used for aesthetic and entertainment purposes. They are most commonly used in fireworks displays (also called a fireworks show or pyrotechnics), combining a large number of devices in an outdoor setting. Such displays are the focal point of many cultural and religious Celebration (party), celebrations. Fireworks take many forms to produce four primary effects: noise, light, smoke, and floating materials (confetti most notably). They may be designed to burn with colored flames and sparks including red, orange, yellow, green, blue, purple and silver. They are generally classified by where they perform, either 'ground' or 'aerial'. Aerial fireworks may have their own Air propulsion, propulsion (skyrocket) or be shot into the air by a Mortar (weapon), mortar (aerial shell). Most fireworks consist of a paper or Card stock, pasteboard tube or casing filled with the combustion, combustible materia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Treatise
A treatise is a formal and systematic written discourse on some subject, generally longer and treating it in greater depth than an essay, and more concerned with investigating or exposing the principles of the subject and its conclusions."Treatise." Merriam-Webster Online Dictionary. Accessed September 12, 2020. A monograph is a treatise on a specialized topic. Etymology The word 'treatise' first appeared in the fourteenth century as the Medieval English word ''tretis'', which evolved from the Medieval Latin ''tractatus'' and the Latin ''tractare'', meaning to treat or to handle. Historically significant treatises Table The works presented here have been identified as influential by scholars on the development of human civilization. Discussion of select examples Euclid's ''Elements'' Euclid's ''Elements'' has appeared in more editions than any other books except the ''Bible'' and is one of the most important mathematical treatises ever. It has been translated to numer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
