Bell pit

A bell pit is a primitive method of mining coal, iron ore, or other minerals lying near the surface.

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Hey this is Anthony with RevZilla TV, where you can watch, decide, and ride. Welcome to our detailed review of the new Bell Pit Boss Half Helmet. So the Bell Pit Boss Helmet is new from Bell. It's going to do a handful of things pretty well, but really the key takeaways, and I have the checkered pattern in front of me this is one of the graphic models, is that this is a half helmet that's going to be DOT and my favorite, favorite thing about this is the way that it fits. Intermediate, oval head shape is going to fit most riders. It's not too long front to back, not too round, but what they've done is they've managed to use an EPS that keeps the DOT but doesn't give you that Toad from Mario Kart type of look. A lot of times with DOT half helmets they sit really, really high on the head and you have people say "Well I don't want to look like I'm wearing a mushroom so I'm going to go with something that is more of a brain bucket." And what you end up with is a non DOT helmet or a helmet that is less comfortable or less safe. Not the case here with the Bell Pit Boss. So what you have is a nice internal guts to it that are going to be wicking and comfortable, but one of the keys here, the first thing that I'm going to hone in on, is the speed dial system from Bell that you see on the back here. It's really, its bicycle technology, Easton-Bell makes tons and tons and tons of helmets for lots of different types of riding, even hard hats, they just make helmets. And what they've done is they've taken technology that allows you to custom fit the circumference of this piece here that's going to fit just along, and it's not going to be uncomfortable. It sits underneath the back of the ridge of your head and there's actually a snap in here so it's multi positionable so if I snap it out here you're going to see that it comes down, you see how there's multiple points that it connects to the helmet. And what it allows you to do, as I snap it back in, it allows you to keep this helmet from lifting of its speed. So whether you're riding its speed, or where ever you position it on your head, it's going to want to go like that when the wind hits it, and by having this really comfortable technology here in the back that you can loosen and tighten it's going to allow you to keep it down. This is straight from the bicycle world. Looking at this helmet too, as far as the shell composite, it's a tri composite which is Bell's high end material for lightweight, 900 grams on this guy so it's very, very lightweight for what it is. A solid is available as well. Removable visor and the other thing about it is it has a removable cold weather neck curtain. So double D-ring closure. I'm going to open it up here, let's look at it. I'm going to zip out this neck liner and show you what it looks like when you pull it off. So, notice it's a snap there, pull the leather piece down. This is for cold weather riding and we're just going to zip it off, it's very easy to do. Zips all the way around. Every Bell Pit Boss has this included. And there is my fleece-lined neck liner for colder weather riding. When I do that you can see the speed dial system very, very clearly and you can also see where it sits. Remember everybody has that occipital ridge in the back of there head, that's kind of where your head slope changes. This is going to sit right below it and be very, very comfortable. So let us know what you think of the Bell Pit Boss Helmet. It's a half helmet; it's the fit that you need to hone in on here. The other thing I didn't mention it has a flip down polycarbonate shield, so eye protection is typically required by most states you can either wear this or rock your sunglasses, it's up to you, and that is spring loaded. We want to hear your feedback, so leave us your notes on YouTube, on our Facebook page, on the product page, and certainly follow up with questions to [email protected] or 877-792-9455. Remember, the Bell Pit Boss is over 39 bucks so we'll ship for free, exchange for free, no restock fees if you need to send it back to us, and as always you can earn TeamZilla Cash on any order over 100 bucks to be applied to your next order. Thanks for watching our detailed breakdown of the Bell Pit Boss Half-Helmet, which we really dig here at RevZilla.com/Bell. I'm Anthony, we'll see you next time.

Operation

A shaft is sunk to reach the mineral which is excavated by miners, transported to the surface by a winch, and removed by means of a bucket, much like a well.^[1] The bottom of the shaft is enlarged and a sloping roof is created as the desired mineral and surrounding rock is removed – giving its name because the pit in cross section resembles a bell.^[2]

Typically, no supports were used, and mining continued outwards until the cavity became too dangerous or collapsed at which point another mine was started, often in close proximity.^[1] This type of mine was in use in prehistoric times, the Middle Ages,^[3] and a few continued in use until the early 20th century in the region around Ford, Northumberland. Such pits are common at prehistoric flint working sites such as Grime's Graves in Norfolk and also in the coal mining areas of Yorkshire, the Forest of Dean,^[4] and Leicestershire.^[3]

Bell pits often flooded due to a lack of a drainage system. This, together with the lack of support and the likelihood of collapse, meant they had a limited lifespan. The remains of bell pits can be identified by depressions left when they collapsed. In some places, they will follow a straight line as the seam of mineral is being followed. Bell pits were not an efficient way of extracting minerals as they only partially exploited the resources.

References

^ ^a ^b "Streetgate Bell Pit". Sunniside Local History Society. Retrieved 2016-05-23. Example and illustrated description
^ Gresley, William Stukeley (1883). A glossary of terms used in coal mining. London, New York: E. & F. N. Spon. p. 17.
^ ^a ^b "Coalfields". Newbold Heritage Group. Retrieved 2016-05-23.
^ Tony Youles; Penny Fernando; Tony Burton; Frank Colls (2008). "Delving in Dean: The Delves – An Area of Unrecorded Early Coal Mining (Part Three)" (PDF). Gloucestershire Society for Industrial Archaeology Journal: 37–52.