Le_Jars Posted September 11, 2006 Share Posted September 11, 2006 Do any of you know where I might be able to buy a digital barometer and thermometer, combined if possible? Thanks Link to comment Share on other sites More sharing options...
Pierre ZFP Posted September 11, 2006 Share Posted September 11, 2006 My local Auchan has a large selection from fairly cheap (around 20 Euros) to amazingly expensive. Link to comment Share on other sites More sharing options...
Cassis Posted September 11, 2006 Share Posted September 11, 2006 They're enormously popular. No French home appears complete without one. Most large supermarkets (like Pierre's Auchan) and DIY places such as Mr Bricolage, Bricomarché usually have a selection. Also Mr Outiror and the other lorries. Link to comment Share on other sites More sharing options...
Le_Jars Posted September 11, 2006 Author Share Posted September 11, 2006 Many thanks, I didn't realise they'd be so easy to find! Link to comment Share on other sites More sharing options...
Cassis Posted September 11, 2006 Share Posted September 11, 2006 Yes - that's why all the French are such experts on the weather! Link to comment Share on other sites More sharing options...
Cassis Posted September 11, 2006 Share Posted September 11, 2006 Here's a whole bunch of them online in case your local shops have sold out!Weather stationsPrices vary wildly - I assume you generally get what you pay for.At the bottom of the page there are some on e-bay as well. Link to comment Share on other sites More sharing options...
Le_Jars Posted September 11, 2006 Author Share Posted September 11, 2006 Hmmm.... I need one that I can stick in the river here (I want to trackit's temperature throughout the year) and I don't see one where I cando this. Perhaps I just have to get an ordinary thermometer which canbe stuck anywhere (arf!) and a seperate barometer. I've tried a medicaldigital theremometer but the range is very small (as in dead to highfever!), so no good for water that gets down to almost freezing! Link to comment Share on other sites More sharing options...
Cassis Posted September 11, 2006 Share Posted September 11, 2006 Well, now you've thrown a curve ball! Why do you want to put a barometer in the river? I can see you might want to know the temperature, if you're fancying a dip, but atmospheric pressure? Link to comment Share on other sites More sharing options...
powerdesal Posted September 11, 2006 Share Posted September 11, 2006 Maybe le_jars is a closet Desalination plant designer??????? Link to comment Share on other sites More sharing options...
Cassis Posted September 11, 2006 Share Posted September 11, 2006 Come on, Dave, what are you up to? Link to comment Share on other sites More sharing options...
Le_Jars Posted September 11, 2006 Author Share Posted September 11, 2006 It's all very simple......I want to stick the thermometer in the riverto test it's temperature (obviously) and I want to know the barometricpressure (not by sticking it in the river, cos there's no need) cos Iwant to know the pressure innit?This is all in the name of fishing. I understand I can catch more fishwhen the pressure is high and the temperature is low enough (for trout). Link to comment Share on other sites More sharing options...
Cassis Posted September 11, 2006 Share Posted September 11, 2006 Okay - sounds reasonable!Here are some thermometers for fishing and I would suggest one of the weather stations already mentioned for your barometer. Link to comment Share on other sites More sharing options...
Le_Jars Posted September 11, 2006 Author Share Posted September 11, 2006 See! I'm not mad!Many thanks for that - I'll see if my local peche/chasse shop has something like those. Thanks again. Link to comment Share on other sites More sharing options...
Dick Smith Posted September 11, 2006 Share Posted September 11, 2006 An old, long story, apologies if you have heard it before:"A question in a physics degree examination at the University of Copenhagen ran thus:"Describe how to determine the height of a skyscraper with a barometer."One student replied: "You tie a long piece of string to the neck of the barometer, thenlower the barometer from the roof of the skyscraper to the ground. The length of thestring plus the length of the barometer will equal the height of the building."This highly original answer so incensed the examiner that the student was failedimmediately. He appealed on the grounds that his answer was indisputably correct, andthe university appointed an independent arbiter to decide the case. The arbiter judgedthat the answer was indeed correct, but did not display any noticeable knowledge ofphysics. To resolve the problem it was decided to call the student in and allow him sixminutes in which to provide a verbal answer which showed at least a minimal familiaritywith the basic principles of physics. For five minutes the student sat in silence,forehead creased in thought. The arbiter reminded him that time was running out, towhich the student replied that he had several extremely relevant answers, but couldn'tmake up his mind which to use. On being advised to hurry up the student replied as follows:"Firstly, you could take the barometer up to the roof of the skyscraper, drop it over theedge, and measure the time it takes to reach the ground. The height of the building canthen be worked out from the formula H = 0.5g x t squared. But bad luck on thebarometer." Or if the sun is shining you could measure the height of the barometer, thenset it on end and measure the length of its shadow. Then you measure the length of theskyscraper's shadow, and thereafter it is a simple matter of proportional arithmetic towork out the height of the skyscraper. "But if you wanted to be highly scientific about it,you could tie a short piece of string to the barometer and swing it like a pendulum, first atground level and then on the roof of the skyscraper. The height is worked out by thedifference in the gravitational restoring force T = 2 pi sqr root (l / g)."Or if the skyscraper has an outside emergency staircase, it would be easier to walk up itand mark off the height of the skyscraper in barometer lengths, then add them up." Ifyou merely wanted to be boring and orthodox about it, of course, you could use thebarometer to measure the air pressure on the roof of the skyscraper and on the ground,and convert the difference in millibars into feet to give the height of the building. But since we are constantly being exhorted to exercise independence of mind and applyscientific methods, undoubtedly the best way would be to knock on the janitor's door andsay to him 'If you would like a nice new barometer, I will give you this one if you tell methe height of this skyscraper'."The student was Nils Bohr, the only Dane to win the Nobel prize for Physics. Link to comment Share on other sites More sharing options...
Cassis Posted September 11, 2006 Share Posted September 11, 2006 [:D] [:D]So you could equally well use several of those methods to measure the height of the building with a thermometer.I don't think I have heard that one before. Did they still fail him for being a smarty-pants?PS I confess that my first thought was to drop it off and measure the time it took to reach the bottom! Link to comment Share on other sites More sharing options...
Le_Jars Posted September 11, 2006 Author Share Posted September 11, 2006 So I can go fishing and measure the height of buildings! Fab! I love France, don't you? [:D] Link to comment Share on other sites More sharing options...
Cassis Posted September 11, 2006 Share Posted September 11, 2006 I do indeed. And I love your new paintings. Sigh. Once I had money and could afford these things - but equally, I never had time to appreciate them or life in general! Link to comment Share on other sites More sharing options...
Deimos Posted September 11, 2006 Share Posted September 11, 2006 Oregon Scientific do a weather sensor system (the WMR 918/WMR928 I think http://www.ukweathershop.co.uk/acatalog/oregon_scientific_cw_sub.html). Its quite expensive (£350'ish) and includes most sensors you would be interested in EXCEPT the river temperature one. It includes temperature, rainfall (cumulative and rate), wind, temp (inside and outside), pressure, etc. Most sensors are RF linked to the base and have solar cells to keep their power going (i.e. true cordless). There is an optional extra sensor to the system that is a swimming pool temperature sensor. This is a floating temperature sensor that measures water temperature (again with its own solar cell and an RF link to the base station, the THWR288 on http://www.ukweathershop.co.uk/acatalog/oregon_scientific_was_sub.html). Depending on how fast the river is flowing you may be able to anchor/tie this swimming pool sensor to the bank/a rock which might provide you what you are looking for.The base station can also be connected to you PC and can be used to record long term weather data, publish your weather data to the internet (your own weather site e.g. http://www.tamworthweather.org.uk/wxflash.htm) or publish to one of the central weather recording systems via METEARS format (e.g. to Weather Underground).Not cheap and maybe far more than you were looking for but it might do the temperature measurement etc. you are looking for.(Sorry, you'll have to cut and paste the links if you are interested in them)Ian Link to comment Share on other sites More sharing options...
Dick Smith Posted September 11, 2006 Share Posted September 11, 2006 [quote user="Cassis"][:D] [:D]Did they still fail him for being a smarty-pants?[/quote]No, they passed him.He was a great lateral thinker.Bohr donated his Nobel (gold) medal to Finnish war relief at the beginning of the Second WorldWar. Soon after the War began he was entrusted with the medals of the Germanphysicists Max von Laue (1914 laureate) and James Franck (1926). Before he escapedfrom occupied Denmark in 1943, Bohr, a meticulous man who was known to write draftsof postcards, dissolved the medals in acid in order to get them safely out of the country.After the War, he precipitated the gold from the acid, and had the medals re-cast. Link to comment Share on other sites More sharing options...
Le_Jars Posted September 12, 2006 Author Share Posted September 12, 2006 Thanks Ian, but yes, that does far more than I need (and is just a tad more than I was going to pay!), but thanks anyway. Link to comment Share on other sites More sharing options...
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