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Speargun Speargun in use by a diver. A speargun is a ranged underwater fishing device designed to launch a tethered spear or harpoon to impale fish or other marine animals and targets. Spearguns are used in sport fishing and underwater target shooting. The two basic types are pneumatic and elastic (powered by rubber bands). Spear types come in ...
A speargun is an underwater fishing tool designed to launch a tethered short spear at a fish or other marine animal (e.g. a lobster). The most popular spearguns are elastically powered by natural latex rubber bands like a slingshot, while pneumatic powered spearguns are also used, but are less powerful. [21]
The 2006 Micronesian Games hosted in Saipan, Northern Mariana Islands, became the first to use modern spearfishing equipment after the owner of a diving shop on the island acquired the right to distribute modern spearguns and long swimfins from a Cressi-Sub company in 2005. [6]
Spear-armed hoplite from Greco-Persian Wars. A spear is a polearm consisting of a shaft, usually of wood, with a pointed head.The head may be simply the sharpened end of the shaft itself, as is the case with fire hardened spears, or it may be made of a more durable material fastened to the shaft, such as bone, flint, obsidian, copper, bronze, iron, or steel.
For telescopic angles, the approximations of = = greatly simplify the trigonometry, enabling one to scale objects measured in milliradians through a telescope by a factor of 1000 for distance or height. An object 5 meters high, for example, will cover 1 mrad at 5000 meters, or 5 mrad at 1000 meters, or 25 mrad at 200 meters.
10 meters – wavelength of the highest shortwave radio frequency, 30 MHz; 10.2 meters – length of the Panzer VIII Maus, the world's largest tank; 12 meters – height of the Newby-McMahon Building, the world's littlest skyscraper; 23 meters – height of Luxor Obelisk, located in the Place de la Concorde, Paris, France
The main blade is 12–14 in (30–36 cm) long [I have not found any sources supporting this measurement, the spetum shown in the image's head is measured at 46 in (118.1 cm) meaning the blade is only marginally shorter than 46 inches], and the side blades are only about half that length and are set at acute angles.
An extensometer is a device that is used to measure changes in the length of an object. [1] It is useful for stress-strain measurements and tensile tests. Its name comes from "extension-meter". It was invented by Charles Huston who described it in an article in the Journal of the Franklin Institute in 1879. Huston later gave the rights to ...