What is the meaning of brattice?
: an often temporary partition of planks or cloth used especially to control mine ventilation.
What is a mining curtain?
i. In coal mines, curtains are used to deflect the air from the entries into the working rooms and to hold the air along the faces. They are usually made of a number of overlapping strips of heavy curtain material, that should be of fireproof or fire-resistant material.
What is a brattice used for?
A brattice is a partition used in mining. It is built between columns of a sub-surface mine to direct air for ventilation. Where the mine is sunk at the base of a single shaft, the shaft is divided into two parts by a wooden or metal brattice.
What were hoardings?
A hoard or hoarding (also known as a brattice or brettice, from the French bretèche) was a temporary wooden shed-like construction that was placed on the exterior of a castle during a siege to allow the defenders to improve their field of fire along the length of a wall and, most particularly, directly downwards to the …
What is a brattice in a castle?
What are hoardings used for?
A hoarding is defined as a temporary boarded fence in a public place, usually erected around a building site. These are used to protect the public from site works whilst also being used to display advertisements.
What is hoarding in a castle?
Why did castles have battlements?
The top of the castle walls were the battlements, a protective, tooth shaped parapet often with a wall walk behind it for the soldiers to stand on. The defenders could fire missiles through gaps (crenels). The raised sections between, called merlons, helped to shelter the defenders during an enemy attack.
What is the difference between hoarding and billboard?
Billboards and hoardings are similar in their promotional purposes, but with a difference in their usual locations. While billboards can be seen in various different locations, hoardings are only found around construction projects as an interesting combination of a safety barrier and promotional display.
How is a brattice used in a mine?
A brattice is a partition used in mining. It is built between columns of a sub-surface mine to direct air for ventilation.
How did the furnace in the brattice work?
A furnace was kept burning within the pit and the hot air rose up the one side of the brattice (the upcast side) drawing cold air down the other (the downcast side). One such pit was Hartley pit. In 1862 the beam of the pumping engine failed and brought down part of the lining resulting in the pit being blocked.
How is air delivered to a brattice shaft?
Air is delivered down one side of the shaft and exhausted upwards through the other. Depending on the type of mine and how the operation is run, brattices can be permanent (concrete or wood) or temporary (cloth). Temporary installations are also called curtains .
Why was a brattice used as a downcast pit?
Rather than bratticing one shaft, it was more convenient to use one shaft as the upcast pit and the other as the downcast pit. Underground however, brattices remained vitally important for directing the current of air throughout the whole of the colliery.