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The fire triangle or combustion triangle is a simple model for understanding the necessary ingredients for most fires. [ 1] The triangle illustrates the three elements a fire needs to ignite: heat, fuel, and an oxidizing agent (usually oxygen ). [ 2] A fire naturally occurs when the elements are present and combined in the right mixture. [ 3]
Pyrography. The King Wolf, pyrography on olive wood by Roberto Frangioni Piroritrattista Framàr. Pyrography or pyrogravure is the free handed art of decorating wood or other materials with burn marks resulting from the controlled application of a heated object such as a poker. It is also known as pokerwork or wood burning.
Shop drawings are produced by contractors and suppliers under their contract with the owner. The shop drawing is the manufacturer’s or the contractor’s drawn version of information shown in the construction documents. [ 1] The shop drawing normally shows more detail than the construction documents. It is drawn to explain the fabrication and ...
Greek fire was an incendiary chemical weapon manufactured in and used by the Eastern Roman Empire from the seventh through the fourteenth centuries.
Drawings of humans were rare and are usually schematic as opposed to the more detailed and naturalistic images of animal subjects. Kieran D. O'Hara, geologist, suggests in his book Cave Art and Climate Change that climate controlled the themes depicted. [29] Pigments used include red and yellow ochre, hematite, manganese oxide and charcoal.
Firewall (construction) Firewall residential construction, separating the building into two separate residential units, and fire areas. Example of a firewall used to inhibit the spread of a fire at an electrical substation. A firewall is a fire-resistant barrier used to prevent the spread of fire. Firewalls are built between or through ...
Depictions of Muhammad date back to the start of the tradition of Persian miniatures as illustrations in books. The illustrated book from the Persianate world ( Warka and Gulshah, Topkapi Palace Library H. 841, attributed to Konya 1200–1250) contains the two earliest known Islamic depictions of Muhammad.
List of drawings by Vincent van Gogh is an incomplete collection of drawings by the Dutch artist Vincent van Gogh (1853–1890) that form an important part of his complete body of work. The listing is ordered by year and then by catalogue number. While more accurate dating of Van Gogh's work is often difficult.