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21st-century hunting compound crossbow. A crossbow is a ranged weapon using an elastic launching device consisting of a bow-like assembly called a prod, mounted horizontally on a main frame called a tiller, which is hand-held in a similar fashion to the stock of a long gun. Crossbows shoot arrow-like projectiles called bolts or quarrels.
The choice between a subsurface drainage system by pipes and ditches or by tube wells is more a matter of technical criteria and costs than of agricultural criteria, because both types of systems can be designed to meet the same agricultural criteria and achieve the same benefits. Usually, pipe drains or ditches are preferable to wells.
The tremie concrete placement method uses a vertical or nearly vertical pipe, through which concrete is placed by gravity feed below water level. [4]The lower end of the pipe is kept immersed in fresh concrete so that concrete rising from the bottom displaces the water above it, thus limiting washing out of the cement content of the fresh concrete at the exposed upper surface.
The energy needed for mixing comes from a loss in pressure as fluids flow through the static mixer. [2] One design of static mixer is the plate-type mixer and another common device type consists of mixer elements contained in a cylindrical (tube) or squared housing. Mixer size can vary from about 6 mm to 6 meters diameter.
Mixing of liquids occurs frequently in process engineering. The nature of liquids to blend determines the equipment used. Single-phase blending tends to involve low-shear, high-flow mixers to cause liquid engulfment, while multi-phase mixing generally requires the use of high-shear, low-flow mixers to create droplets of one liquid in laminar, turbulent or transitional flow regimes, depending ...
Tile drainage is a form of agricultural drainage system that removes excess sub-surface water from fields to allow sufficient air space within the soil, proper cultivation, and access by heavy machinery to tend and harvest crops.
Inside of an arrowslit, where an archer would stand, at Corfe Castle. Exterior view of arrowslits in the Bargate gatehouse in Southampton. An arrowslit (often also referred to as an arrow loop, loophole or loop hole, and sometimes a balistraria [1]) is a narrow vertical aperture in a fortification through which an archer can launch arrows or a crossbowman can launch bolts.
A thorough diagram of a crossbow. Notice the upwardly-curved bow, which was the change that most affected the bullet-shooting crossbow. Two pellet bows from Codex Löffelholz, Nuremberg 1505. A bullet-shooting crossbow, also known as prodd, [1] pelletbow, ballester, stone bow, or rock-throwing crossbow, is a modified version of the classic ...