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The hollow spikes puncture self-sealing rubber tires. The hole in the center allows air to escape even if other ends of the tube are sealed by soft ground. Inventors patented caltrop-like devices to deflate vehicle tires in a manner useful to law enforcement agencies or the military. [18] [19] They are currently used by the military and police. [5]
The spike maul, also known as a spiking hammer, is a type of sledgehammer with a long thin head which was originally used to drive spikes. [30] [31] Manual hole drilling and spike or screw insertion and removal have been replaced by semi-automated or automated machines, which are driven electrically, by pneumatics, by hydraulics, or are powered ...
Using digging bars to move rocks A girl and a man dig a hole with a heavy digging bar to plant a tree. Common uses of digging bars include breaking up clay, concrete, frozen ground, and other hard materials, moving or breaking up tree roots and obstacles, and making holes in the ground for fence posts.
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5) concrete 6) spiral-shank 7) ring-shank (a used, bent "gun" nail, with barbs left over from the tool's feed system) Horseshoe nails Nail-maker's work-bench or anvil in a storeroom of the Black Country Living Museum Railroad spikes of the old Jezreel Valley railway (part of the Hejaz Railway ), found near Kfar Baruch (Israel) A capped nail for ...
It is a simple spike, made out of wood or bamboo, which is sharpened, heated, and usually set in a hole. Punji sticks are usually deployed in substantial numbers. [ 1 ] The Oxford English Dictionary (third edition, 2007) lists less frequent, earlier spellings for "punji stake (or stick)": panja, panjee, panjie, panji , and punge .
Degrading concrete has been the focus of many studies and the most obvious sign is calcium-rich leachate seeping from a concrete structure. [5] [6] [7]Calthemite stalactites can form on concrete structures and "artificial caves" lined with concrete (e.g. mines and tunnels) significantly faster than those in limestone, marble or dolomite caves.
A growing number of skiers, weary of high prices and long lift lines at crowded resorts, are turning to the solitude of backcountry slopes. But the avalanche dangers are real, and skiers should go ...
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