Three Pin Lewis Demonstration
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- čas přidán 9. 07. 2022
- A three pin lewis, also known as a dovetailed lewis, St Peter's keys, or a Wilson bolt fits into a dovetailed seating in the top of a building stone. It is made from three pieces of rectangular-section steel held together with a shackle, allowing connection to a lifting hook. The middle leg is square throughout its length, while the outer legs are thinner at the top, flaring towards the bottom. Held together, the three legs thus form a dovetail shape.
They are now illegal in the UK but were still in use when I started my career. - Zábava
No idea why youtube showed me this video, but I watched it regardless. I do no feel my time has been wasted.
Not or now?
@@billrosenstein bit of both.
You, too, huh? This was out of the blue for me.
Really don't care about the feelings of the creator at all work a callous comment like that. I really liked this video and found it informative
@@davidpile2576 that's a bit skitzo .
please for the love of all, keep making videos showing how we used to do things so this knowledge is not lost.
I was waiting for him to be arrested at the end. Very disappointing.
Mason when arrested: "It's a fair cop."
I was waiting for the part where the dinosaur signalled it was the end of the working day and he went home in his open bottomed car .
"What are you in for?"
"Murder. You?"
"I used a three-pin lewis."
And they all moved away from me on the bench.
The UK will arrest people for memes so this is nothing
It's illegal to use because it's not that safe.
A MASTER, as this guy probably was, knows what he's doing.
But someone less skilled only has to cut the hole slightly wrong and it will fall out. or if the stone is bad, the force wil fracture it, and it will fall out.
You need something that works, even if the guy doing it is clueless.
And when you're lifting multi ton stones, yeah, you wanna get it right.
I call Three Pin Lewis And the Stonemasons as my new band name.
Nice....
All your admirers will want to see your centre pin… just be careful what you let them pass through the eye
Not bad
I have worked with old stone masons who didn’t have power tools, and I have helped them to build a couple of private mausoleums. They were 8” thick granite walls 8’x10’ they called that device a German key. The Lewis pins we use are single angled apposing holes. Sometimes as many as three mostly two. And the type of steel they are made of now makes them very expensive but they work great,because you can’t use straps when setting walls. And also the pinned stone clamp works too and cheaper.
Hello, Dr., I watched this video that was randomly offered by CZcams, which rarely got is useful out entertaining and EDUCATIONAL, but this is. I subscribed and I hope to see more.
"What are you in for?"
"Murdered my family. You?"
"I used a three-pin lewis."
And they all moved away from me on the bench.
Nice reference
Litterbuggin
The Group W bench!
Ha, ha, ha, that is a funny response thumbs up!
🤭
The Stomasons’ Guild of St. Stephen and St. George’s. What a title, absolutely wonderful.
Thank you for recording an posting this valuable educational video.
The entire time I've been getting it wrong. I was using a two pin lewis. Now maybe I can make some progress on my stone moving.
This is great! I've learned more in the comments than I expected 👍
We have these holes in the 1891 stone and brick mansion we are restoring. We don't trust the old holes so we have just been using cargo straps. Every once in a while one of our viewers will mention these Lewis pins.
Don't trust them holes! 😂
It's always a pleasure to watch an Operative Mason at his craft!!! 🤠👍
An Operative Mason you say? Whence came ye?
@@diogeneslantern18 From the West, I bet.
Using those round hammers is a trick! Lots of practice to do that effectively
@@diogeneslantern18From a Lodge of the Holy Saints John.
Stephenville #267 and Clairette #1052 AF&AM. 😁
@@CristiNeaguThe East.
PM.
He picked up the three pin Lewis, the most difficult spare in all of bowling!!!
I always wondered...Thanks for a great video, impressive demonstration with a clear narration. Well done, Sir, well done indeed.
Do you cut a keystone shape in the stone, with the bottom wider? The 3 pieces fit too loosely to think otherwise, not that it needs to be a tight fit in either dimension.
They allow a stone to be positioned or fitted into a slot where other lifting systems would get in the way. The quality of the stone is important as the device puts the block in tension (splitting). My opinion, for what it's worth, is from basic mechanical engineering and dry stone wall building experience.
thanks. I was about to ask "why is this a thing when we have ropes?"
@@zachweyrauch2988- Ropes would be difficult to remove once the stone was in place if you had it sitting on them. You could use either nubs or pins driven into the sides of the stone to lift with ropes rather than having the rope lift from under the stone.
Illegal you say?! “Pulls out my 4 pin Geoffrey” the police run away screaming
Interesting but there’s plenty of stuff we don’t do now that we used to. Safety rules are written in blood.
Oi mate! Ya got a loicense for that there dangerous lewis??
Used one in the ceiling of a bath stone quarry to lower crane parts years ago.
People always tell me the cylindrical hammers are better until I try using one in front of them 😅
I love learning the "Old Ways" as the ingenuity of simple tools built way more things than the modern equivalents. There's a time and place for everything.
This method was banned because the pins pull out and workers have died from the falling stone. So much for the old ways.
It's a neat little device, but saying it built more than modern cranes is just nonsense.
@@andrewhooper7603well, really the old devices built much more impressive and far more beautiful and character full buildings such as cathedrals
BRILLENT !!! I love it.......simple.....and it works.
Fantastic, learnt something new today. Thank you!
Interesting demonstration! (new subscriber, stone-carver, Virginia)
Great little video!
SO SIMPLE... EXCELLENT VIDEO, STAY SAFE
Fantastic chisels. They must be very hard and yet not brittle.
That's what she said...
Not in many years. 😢
Love the skill.
Ingenious idea
Good work brother!
Wonderful!
Learned something. Safe for smaller blocks, with care, clean stone, surely.
Very cool thank you for sharing that is a lot of work for one stone
Yeah it should be illegal for being a gd waste of time
@@LT1 I don't know anything about being a stone Mason so I would not know if this is a waste of time
@@LT1 Why is it a waste of time?
A simple but great and illagal technique. 😊
That s the same idea granite quarries use to pick up massive blocks of stone that weigh many tons. Of course it’s much larger than this. And the hole is drilled in with a jackhammer.
is there a particular reason they are illegal now?
My guess is safty reasons.. 🤷🏻♂️
It's held only by preasure.
@@SmokinnnnThat's my guess as well. It's too easy for a novice to carve the slot improperly, and the key to slip out while the block is in midair. It's also not guaranteed that a hidden flaw in the stone won't cause it to split while in midair and there is a ton of pressure on that wedge.
@@Scarabswarm
Exactly mate. Sounds logic to me.
✌🏽🍻
@@Scarabswarm Either that or the pin failing. Ultimately, it's less safe than modern methods. Guarantee it was safer than alternatives when it was created but times move on and if we can save even a single life, we should.
Super cool video
Very cool!
Very interesting, thanks!😊
i wonder if this method was not to be used for stones exposed on the upper side of buildings as rainwater pooling and freezing in the slot (if turned upwards) could have prematurely weathered and split the stone
It's UK, I will bet it's either something to do with H&S or someone was offended...
@@tomekciepiaszuk582 What on Earth are you talking about? The question was about whether this method would have been used _in the past_ for stones on upper surfaces.
@@beeble2003 Ah yes, clearly I didn't pay enough attention, ignore me.
@@tomekciepiaszuk582 Fair enough. :)
The holes would be in the mortar joints between courses. Capstones would be lifted wrapped with rope or inverted
Neat. Thanks for this info.
I assume that they were effective and easy to use, but the blocks can still split, so they were made illegal to stop people from using them. Professionals may have an occasional accident but the tool is so easy to use that amatures would cause all sorts of trouble. A pity.
Pretty cool, though I can see why it is illegal, someone that did not know how to make it right could kill someone lifting it
How? Someone lifting it would not be so stupid as to walk under it. Would they?
Yeah I work with a couple of morons that are a little high and do stupid stuff like that. I work at a small stone quarry and have seen them walk under parts of the crusher as we had to replace some of it.
@@jeffharper7579do they not put a barrier up to alert people of the overhead danger?
@@paulfrost8952 if you have a controlled number of people on site (ie staff and not public) then information rather than barriers is standard practice for lifts.
Barriers can be impractical and people still walk through them.
@@pobvic if the barrier can be walked through it’s not a barrier!
Out of a million people.....maybe three or four could do that..!!
I liked it.
What’s the largest size block you would lift with this? Would you ever use more than one in a single block?
I don’t know exactly but I have seen very large Lewises
Good. Thanks.
What!!! No alien rock melting tech.
Sorry
I can definitely see why its banned for use. probably wasn't uncommon that a stone could split and fall
A very good traditional technique.
Unfortunately, I had to realize during the restoration that the weaker the sandstone, the more susceptible it is. Microcracks form and over time the stone cracks in two.
I like that👍
How long did it take? 15 minutes?
Explains how they hoisted blocks into place
Didn't catch the first few words, what is illegal to use?
The three-pin Lewis that the whole video is about.
First time I've seen a stonemason wearing a tie at work!
that would depend on your clients.
I feel like I'm about to be served a 60 degree ale, not a rock.
Why is it illegal?
Stonemason’s version of “Ridin’ Dirty”.
Why's it illegal?
Neat 🙂
How heavy of a stone can this move?
Why would it now be illegal to use?
Splitting large rocks high in the air annihilating crewmen and passersby alike is my guess.
Things fall, people get crushed, we have safer methods.
Illegal? What am I missing
Neat
why is it now illegal to use?
Not safe
This device must have pre-dated safety. Safety is a modern concept designed to add thousands to the cost of everything, slow everything down, provide employment for a whole subculture of “safety” experts and increase the salary of everyone involved as a “pass through cost” to consumers.
@@johnfisher7143… and probably save a few lives along the way…
@@johnfisher7143 Boy did you hit that one square and true. Safety is fine and all but there comes a point that if you need to feel that safe, it would be best that you just stay wrapped up in bubble wrap and your little blankie at home in Mommy's basement being fed pudding and pre-chewed bread...
I guess the safety question is 'how often does this fail?' causing a large heavy stone to fall with a lot of potential for damage. As well as whether this could compromise the internal strength of some stones (1 or a few in a wall?) which could cause a lack of expected structural strength.
Probably just a bunch of pussies though looks good enough just slap er and make sure you say "that ain't going anywhere" LOL
Why is it illegal now?
It can fail.
So what is this for? Im so confused.
He says in the beginning. It's an old method of lifting stones with a crane or tackle block.
thanks
My middle name is Lewis… I wonder if it is somehow related to stone masonry.
Illegal?
Used to be a man could hoist his own stones up with a simple lewis, but can't anymore because woke.
In the Freemasons a Louis (or Louey) is the son of a Freemason who will be elevated to power when he is shaped from a rounded individual into a square and true man.
Why is it illegal now? Unreliable?
they can fail if they are snatched up to quickly, no problem with an old rope pully or block and tackle but with an electric winch or crane they can brake the stone around them and pull out.
I always thought they levitated the stones with alien technology.
That's plan b in case the requirements of the project render the lewis method impossible.
They did. This whole video is part of an elaborate ruse, thousands of years old, to deceive the public and conceal the truth about the aliens.
Nah, on those cathedrals, just the power of prayer, nothing sci-fi about it. Although concentrating hard enough on holy thoughts wasn't easy after nine pints of Mistress Hathaway's Devilgriper Ale the night before.
I enjoyed the video. Very interesting stuff. How come the mechanism is illegal now?
If the stone had an unknown fault, and we're talking much bigger stones being lifted way up in the air, it could let go while being moved and fall to the ground killing whoever was unfortunate enough to be under it, or possibly doing some serious damage to infrastructure. It was a system that didn't have any backup if it failed. These days we can add multiple chains and / or straps to something being lifted.
Also the process of adding the holes it needed to install it, could cause damage to the stone you didn't want in the finished product.
@@PathosBedlam so you know of this method failing then
@@paulowens2062 No, I'm sure.
oi mate where's ya 3 pin lewis loicense
Stonemason ASMR. Thanks YT algorithm
Why didn’t he just pick it up and move it with his hands?
The Freemasons hate him for revealing the secrets.
For the next few days if I hear anyone mention a Three Pin Lewis, I'll know exactly what they mean and will come across as very knowledgeable. After that it will be "who"?
love to watch stonemasons....
All that chiseling just to make a hole to lift the block with. Crazy to think about how many blocks had to be moved like this
There are a lot of rock climbers that started getting bad ideas here.
So, this is a very clever design, but I think an explanation is in order, an explanation of why this device is better than simply putting ropes around a stone. Is it because this device allows a stone to be placed very precisely where it's going, so builders don't need to deal with any movement or instability at height? Ropes seem like they'd save time, but maybe removing them up high is more risky?
Apart from this time consuming method there is a way simpler one. (Not to mention that this method has the potential to split the stone.)
Almost all of the stones in gothic cathedrals have 2 or 4 small holes on both sides and they were hoisted up with a simple claw very similar to 20th century ice block claws. The larger the weight of the stones, the tighter the claw grips compressing it.
The first I learned of this was observing Segovia aqueduct back in 1996, and noticing all those holes and surmising they might have been for lifting. I had to look them up later. No internet for me then.
I don't have much experience with historical (or any) stonework, but at first glance, this seems like an awful lot of work just for the purpose of lifting the stone. Why not use a simpler method, like the self-locking claw things, for example? Cool technique, though.
Those were not made when these were widespread. It's a historical demonstration of how it used to be done.
@@timothydoyle9635 Hm, I thought those claws were pretty old too. I remember seeing one in the museum of the Charles Bridge in Prague, which was built in the 14th century.
They probably provide a more secure hold on the block. I've seen several of these holes in stone mines in Wiltshire. They're an easy thing for a blacksmith to manufacture as well which probably helps
They were used because there's no encumbrance on the sides or bottom. So no complicated fitting issues to overcome, just set it in place and done.
Forging one of these is much easyer and can be done in a smaller smiths. Big claws require big forges and good metal quality. Small tools are easyer to maker
greeting fellow algorithm surfers 🏄
I feel that just lifting it would be quicker.
I was just happy when the dude talking over the guy doing the demonstration finally stopped talking. Really bothered me for some reason.
Why is it now illegal? I can't understand your accent.
Because if you make the slot slightly too big, the block can fall. Also, the key exerts an outward pressure on the block, which can split it if it contains cracks.
seems like it would be easier and faster to just stick the thing in a net, or just pick it up and carry it.
In what contexts is this the quickest or easiest way to get the stone where you want it?
In the context of having to place the block on a wall, and not having a net suddenly pinned beneath it. By carrying the block from the top, you can lower it into its exact place and not have to try and shift it while straddling a half-built wall 50 ft in the air.
This is used on bigger blocks as well, the small stone was just for demonstration purposes. Nobody is carrying a 300lb block up a rickety wooden scaffold. Or having to one-hand it while trying to maneuver the net out from under it.
According to Wikipedia it's called a Three-legged lewis. Dovetailed lewis, St Peter's keys, or a Wilson bolt are mentioned there as well but "three pin" is not mentioned anywhere.
I feel like "3 legged Lewis" is also the name of a gifted local guy who, well, has characteristics.
Why is it illegal?...is it addictive or something?
probably enjoyable or carcinogenic.
Because it naturally puts pressure from inward to outward there’s a chance of splitting the block.
I believe any average sized man could have easily lifted up that stone without all of that work.
What up a ladder?
I assume that was for setting a stone next to 1, or between 2 stones, with or without mortar. They didn't have a tong-like device similar to the ones used in the early 1900s when ice wagons delivered ice. (That's why "ice box" was used in reference to a modern refrigerator.) One can save time not chiseling a lewis hole. A rope & pulleys will lift a stone from the ground to an upper level of installation.
Knowing how concrete anchors work, wouldn't it make sense to have the center pin be wedge shaped instead of the outside ones, and then only have the eye on the center pin (so pulling on it just wedges it harder)? Am I missing something?
What's the purpose of this?
He mentioned at the beginning, that you can use this method to attach a shackle to the stone in order to lift/move large stones id imagine using a crane or gantry system
Use gorilla glue ?
Something tells me a cart would be quicker.
Is that how the pins are fixed into the Stone of Destiny?
Why are they illegal? Its not like they're cigarettes or alcohol
Isn't a Lewis also the Masonic term for the son of a mason?
Small stones up to one hundred pounds maybe ,but a one ton stone ,straps are best.