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turned
Turned A (capital: Ɐ, lowercase: ɐ, math symbol ∀) is a letter and symbol based upon the letter A.
Lowercase ɐ (in two story form) is used in the International Phonetic Alphabet to identify the near-open central vowel. This is not to be confused with the turned alpha or turned script a, ɒ, which is used in the IPA for the open back rounded vowel.
It was used in the 18th century by Edward Lhuyd and William Pryce as a phonetic character for the Cornish language. In their books, both Ɐ and ɐ have been used. It was used in the 19th century by Charles Sanders Peirce as a logical symbol for 'un-American' ("unamerican").The logical symbol ∀, has the same shape as a sans-serif capital turned A. It is used to represent universal quantification in predicate logic, where it is typically read as "for all". It was first used in this way by Gerhard Gentzen in 1935, by analogy with Giuseppe Peano's turned E notation for existential quantification and the later use of Peano's notation by Bertrand Russell. In traffic engineering it is used to represent flow, the number of units (vehicles) passing a point in a unit of time. It may also be used in unit rates.
According to the principle of acrophony, the letter A originated from the Proto-Sinatic alphabet as a symbol representing the head of an ox or cow, its orientation and original meaning having been lost over time. The turned A symbol restores the letter to a more easily recognizable logographic representation of an ox's head.U+1D44 ᵄ MODIFIER LETTER SMALL TURNED A is used in the Uralic Phonetic Alphabet.
I have a kitchen mixer tap with one simple lever controlling temperature and flow. The street water was cut off for a few hours. After that, the hot water flow worked as before, but the cold water flow was very weak. With the tap set to cold, if I open the tap about half way, the flow is the...
New homeowner. I was trying to prep for winter by draining the outside hose. I thought I found the right valve, turned it off and ran the water outside. The water didn't stop flowing so I figured it was the wrong valve. Went back inside to find that the shower head in my basement washroom was...
Water is constantly running through the cold pipe that leads directly from my stop tap through a few meters of pipe along and then upstairs. I can clearly hear it (and so can the rest of the family)and feel the vibration caused by the flow of water through the pipe. When I turn the stop-cock off...
Completely baffled by this problem and hoping someone out there can shed some light. Moved into a new home 8 weeks ago, had boiler checked and everything seemed fine. As of yesterday we suddenly found we had no hot water. We have now discovered that we can still get instant hot water but only if...
So for a while, our boiler a Vaillant EcoTec Plus has made a whining noise, usually in the morning when it first comes on but can happen any time of the day (when on). The first time it happened I turned on a hot tap and it stopped. I have been doing this ever since, but actually, it is annoying...
Hi Guys hope you can help, I have a wet underfloor heating system and have 6 zones, the problem I'm having is one of the zones is getting warm even though the master thermostat/controller is turned off, the pump is not being switched on so is not circulating through the system. I have an 'Ideal...
In April 2018 I had a water meter installed at my tenancy property (Not a property magnate, just had to move out of the area and couldn't sell it) the same time I had a new Greenstar 30i boiler, stopcock and old back boiler and immersion tank removed.
There is a small pass noticeable through...
Matt Carney
Thread
boiler
cold
cold water
internal
leak
oil
still
turned
water
No paperwork - littl' ol' lady with no idea-
She turns the roomstat down at night and then in the morning when she turns it up, boiler doesn't fire, she has to go an reset it, then it works fine again.
Fan is a little noisy/ 'gold' pump at boiler end is quite noisy/ gas supply is 22mB...
Good morning,
I'm new here. I have just completed the academic side of my Gas Ssafe course, now looking to complete a portfolio.
Previously, I owned and ran a controls company that was an NICEIC approved contractor, working on commercial buildings. I was the Qualified Supervisor, as a...
Hi All,
Before we start I will admit that I am a total novice when it comes to plumbing but before I call someone out I want to try and see if it is something simple. I have a triton mixer shower and when the tap is turned all the way to hot it doesn’t effect the temperature at all! It remains...
Hi guys
Went to do a landlords gas check last night.
Boiler was off at the wall, tenant in the middle of moving in. She said the boilers been switched off for approx 3-4 weeks since the last tenant moved out.
I switched it on, blue light illuminated for power straight away. Created a demand...
Hi, I’ve had a problem recently since I moved the pipes to my radiator from one side of the room to the other (in a bungalow so pipes go through ceiling into loft).
Even with the CH turned off I still get hot flow pipes to all radiators, the rads are just slightly warm at the top & all return...
Hi there,
We have a mixer shower in our bathroom. In order to make the shower work we have to turn it onto full (at which no water comes out) and then turn the hot tap in our bathroom sink immediately on and off, at which point water then comes from the shower.
Does anyone have any ideas what...
hi, have a worcester highflow 4.5. working fine until recently where the central heating stopped coming on, although I can manually operate the diverter valve and have it heat that way (if I lock the diverter valve open). So I thought the synchron valve was the issue, replaced that. Now it seems...
Hi,
A few days ago, I turned off the water for my house from the main stopcock to replace a washer in toilet, because it is difficult to access the position to just turn that one cistern off.
But after I finished the washer replacement and turned the main stopcock on, some of the radiators...
Hi all,
I recently replaced the compression type valves on my bathroom basin as the cold one was leaking and also when you tried to turn it on the handle would do almost a complete turn before the valve would open and water came out. Thought this was a knackered circlip and seemed to be so when...
I have a Vaillant Turbomax Plus combi of 2004 vintage. When a cold tap is used nothing happens to the boiler, but as soon as the cold tap is turned off, the boiler starts up for a short time. The hot water demand lights up and the fan (maybe also pump??) runs, but the boiler doesn't get as far...
We had a new combi boiler fitted 2 weeks ago. We also had all new rads put in with TRVs. Except one.
This one is in a bedroom and got very hot I understand that this is the bypass rad. My other half who sleeps in there turned it off. Will this have an effect on our boiler? Can we run it without...
Hi All
I have an unvented Megaflo hot water tank and ecoTEC plus Vaillantboiler. I also have a traditional exposed shower by Bristan 1901 range.
In the mornings whenthe shower valve is turned to activate the water flow the chrome pipe that isattached overhead to the showerhead briefly judders...
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