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Bird control spikes on a roof in Denmark. A bird control spike, also known as an anti-roosting spike, [1] pigeon spike, or roost modification, is a device consisting of long, needle-like rods used for bird control. Bird control spikes can be attached to building ledges, street lighting, and commercial signage to prevent wild or feral birds from ...
Copper Leader Head at Penn's Quadrangle, Philadelphia 1894 Copper Leader at Shofuso Japanese House and Garden in Philadelphia. The purpose of a leader head is to help transfer excess water from the roof onto downspouts, thus preventing the gutters from overflowing and water washing over the walls, which is a common occurrence in areas susceptible to heavy rain cycles.
The thin antenna-like structure mounted on the nose cone is the aerospike, which is composed of two parts. 1) The Extensible Boom is the long, slender, slightly tapered cylindrical structure; the wider "underside" is mounted to the nose cone.
The water drains into a gutter that is fed into a downpipe. A flat roof should have a watertight surface with a minimum finished fall of 1 in 80. They can drain internally or to an eaves gutter, which has a minimum 1 in 360 fall towards the downpipe. [11] The pitch of a pitched roof is determined by the construction material of the covering ...
Downspouts are usually vertical and usually extend down to ground level, although may be routed at an angle to avoid architectural features and may discharge onto an intermediate roof. At the bottom of downspout there are typically features to divert discharged water away from the building's foundations to prevent water damage.
She points out that high-added-sugar drinks like soda are burned quickly in the body and cause insulin levels to spike, which can encourage fat storage. Research has also linked high consumption ...
In the black-necked screamer (Chauna chavaria) the spikes are oval in cross-section, but in the southern screamer (Chauna torquata) there is a sharp-edged keel along the spike's proximal edge, and in the horned screamer (Anhima cornuta) the spikes are triangular in cross-section with three sharp keels. [20]
Feral pigeons (Columba livia domestica or Columba livia forma urbana), also called city doves, city pigeons, or street pigeons, [1] [2] are descendants of domestic pigeons (Columba livia domestica) that have returned to the wild. [3] The domestic pigeon was originally bred from the wild rock dove, which naturally inhabits sea-cliffs and ...
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