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Lost Inventions
This is a list of lost inventions - technologies whose capabilities can no longer be produced in their original form. It does not include theoretical inventions. Certain lost inventions * Artificial petrifaction of human cadavers invented by Girolamo Segato. * Greek fire, a Byzantine incendiary weapon used to set enemy ships on fire. * '' Panjagan'', a projectile weapon or archery technique used by the later Sasanians that could shoot a volley of five arrows. Questionable examples It is unknown whether these inventions truly existed, had all of their described properties, or were truly novel. * Archimedes' heat ray, a device that Archimedes is purported to have used to burn attacking Roman ships during the siege of Syracuse. * Claw of Archimedes, purportedly a sort of crane used to drop an attacking Roman ship partly down in to the water during the siege of Syracuse. * Polybolos, an ancient Greek repeating ballista. A ''MythBusters'' episode built and tested a replica, concludi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Petrifaction
In geology, petrifaction or petrification () is the process by which organic material becomes a fossil through the replacement of the original material and the filling of the original pore spaces with minerals. Petrified wood typifies this process, but all organisms, from bacteria to vertebrates, can become petrified (although harder, more durable matter such as bone, beaks, and shells survive the process better than softer remains such as muscle tissue, feathers, or skin). Petrification takes place through a combination of two similar processes: permineralization and replacement. These processes create replicas of the original specimen that are similar down to the microscopic level. Processes Permineralization One of the processes involved in petrifaction is permineralization. The fossils created through this process tend to contain a large amount of the original material of the specimen. This process occurs when groundwater containing dissolved minerals (most commonly ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
