KevMc Posted March 21, 2019 Report Share Posted March 21, 2019 30 minutes ago, Machpoint005 said: Strictly speaking, the 1824 Act defined the yard, not the foot, and by reference to a model yard (standard) at that time, not to the atomic constants by which the metre is now definied. As I said, since 1959 the foot has been defined in terms of the international (SI) metre, so it is exactly 0.3048 of the length of the path travelled by light in vacuum during a time interval of 1/299792458 second. Which is a totally relevant, and easily understood constant 1 Link to comment Share on other sites More sharing options...
WotEver Posted March 21, 2019 Report Share Posted March 21, 2019 16 minutes ago, KevMc said: Which is a totally relevant, and easily understood constant I need to measure up for a new carpet. Now, how to seal the room for a vacuum... 1 Link to comment Share on other sites More sharing options...
tree monkey Posted March 21, 2019 Report Share Posted March 21, 2019 1 minute ago, WotEver said: I need to measure up for a new carpet. Now, how to seal the room for a vacuum... Lots and lots of gaffa tape and good quality marine ply 1 1 Link to comment Share on other sites More sharing options...
john6767 Posted March 21, 2019 Report Share Posted March 21, 2019 31 minutes ago, WotEver said: I need to measure up for a new carpet. Now, how to seal the room for a vacuum... If you want it to be accurate. BTW, what has any of this got to do with TV licences? Link to comment Share on other sites More sharing options...
Machpoint005 Posted March 21, 2019 Report Share Posted March 21, 2019 31 minutes ago, WotEver said: I need to measure up for a new carpet. Now, how to seal the room for a vacuum... The point is that you don't need to set up the experiment, just to know that somebody has done it and your own measuring stick is in full agreement with it, This is called standardisation. The science of ensuring the standards are properly defined is metrology. Without it, aeroplanes would fall out of the sky. Link to comment Share on other sites More sharing options...
TheBiscuits Posted March 21, 2019 Report Share Posted March 21, 2019 32 minutes ago, WotEver said: I need to measure up for a new carpet. Now, how to seal the room for a vacuum... If you have never vacuumed before, it's no wonder you need a new carpet! 2 1 Link to comment Share on other sites More sharing options...
Machpoint005 Posted March 21, 2019 Report Share Posted March 21, 2019 ..but if you are measuring the room for a carpet,it's best to use metres because that's how carpets are made and sold. Link to comment Share on other sites More sharing options...
WotEver Posted March 21, 2019 Report Share Posted March 21, 2019 32 minutes ago, Machpoint005 said: ..but if you are measuring the room for a carpet,it's best to use metres because that's how carpets are made and sold. But I still need to seal the room up and measure a photon. 33 minutes ago, Machpoint005 said: This is called standardisation. The science of ensuring the standards are properly defined is metrology. Without it, aeroplanes would fall out of the sky. So why don’t vintage British aircraft fall out of the sky? They’re all made to good old-fasioned feet and inches, none of this modern metric stuff. Link to comment Share on other sites More sharing options...
cuthound Posted March 21, 2019 Report Share Posted March 21, 2019 1 hour ago, john6767 said: If you want it to be accurate. BTW, what has any of this got to do with TV licences? Detector vans travel at the speed of light (according to legend) ? Link to comment Share on other sites More sharing options...
Wanderer Vagabond Posted March 21, 2019 Report Share Posted March 21, 2019 1 hour ago, Machpoint005 said: The point is that you don't need to set up the experiment, just to know that somebody has done it and your own measuring stick is in full agreement with it, This is called standardisation. The science of ensuring the standards are properly defined is metrology. Without it, aeroplanes would fall out of the sky. Interestingly I bought a tape measure from B&Q yesterday, it had a small label attached to it that, whilst in the shop the print was too small for me to read. When I got it home and dug my glasses out it clearly reads 'Made in China. Measurements are approximate" I didn't pay £1.95 for a tape measure that will tell me that the piece of wood is approximately 2 metres long!!!! Link to comment Share on other sites More sharing options...
LadyG Posted March 21, 2019 Report Share Posted March 21, 2019 9 hours ago, Sea Dog said: You can mute the spoken directions and just have the visual guidance if you prefer Mike. I often use my (built in) Nav like that, particularly on familiar journeys where I'm really only monitoring the traffic situation. hmmmnn .... why bother with SatNav when you know where you are going? Link to comment Share on other sites More sharing options...
rusty69 Posted March 21, 2019 Report Share Posted March 21, 2019 1 minute ago, LadyG said: hmmmnn .... why bother with SatNav when you know where you are going? In case he forgets! its his age you know. Link to comment Share on other sites More sharing options...
cuthound Posted March 21, 2019 Report Share Posted March 21, 2019 22 minutes ago, LadyG said: hmmmnn .... why bother with SatNav when you know where you are going? Many modern satnavs check traffic conditions on the route and redirect you if there is a prolonged hold up, to prevent you joining the queue. Link to comment Share on other sites More sharing options...
rusty69 Posted March 21, 2019 Report Share Posted March 21, 2019 (edited) 3 minutes ago, cuthound said: Many modern satnavs check traffic conditions on the route and redirect you if there is a prolonged hold up, to prevent you joining the queue. Whhaaaaat! What happened to our RIGHT to sit in a queue.As a British citizen it my fundemental right to sit in a queue. I hope it gives you an option before taking away this right? Edited March 21, 2019 by rusty69 Link to comment Share on other sites More sharing options...
Tumshie Posted March 21, 2019 Report Share Posted March 21, 2019 2 minutes ago, rusty69 said: As a British citizen it my fundemental right to sit in a queue. You been on reddit again, intcha. 1 Link to comment Share on other sites More sharing options...
Machpoint005 Posted March 21, 2019 Report Share Posted March 21, 2019 3 hours ago, WotEver said: But I still need to seal the room up and measure a photon. So why don’t vintage British aircraft fall out of the sky? They’re all made to good old-fasioned feet and inches, none of this modern metric stuff. Perhaps because they have no electronics, no hydraulic systems, no GPS based navigational aids, no gas turbines .... Why do you need to measure a photon? Isn't an expert's measurement good enough for you? 2 hours ago, Wanderer Vagabond said: I didn't pay £1.95 for a tape measure that will tell me that the piece of wood is approximately 2 metres long!! No tape measure ever made can tell you a piece of wood is exactly 2 metres long! The approximation is near enough, though, for practical purposes. Link to comment Share on other sites More sharing options...
Sea Dog Posted March 21, 2019 Report Share Posted March 21, 2019 11 hours ago, Sea Dog said: You can mute the spoken directions and just have the visual guidance if you prefer Mike. I often use my (built in) Nav like that, particularly on familiar journeys where I'm really only monitoring the traffic situation. 2 hours ago, LadyG said: hmmmnn .... why bother with SatNav when you know where you are going? How can I put this... To monitor the traffic situation! 2 Link to comment Share on other sites More sharing options...
Sea Dog Posted March 21, 2019 Report Share Posted March 21, 2019 5 hours ago, Machpoint005 said: ...so it is exactly 0.3048 of the length of the path travelled by light in vacuum during a time interval of 1/299792458 second. My missus is nippier than me with it but, even with her driving, I can't imagine the light in our vacuum moves very much at all in that brief time! Link to comment Share on other sites More sharing options...
john6767 Posted March 21, 2019 Report Share Posted March 21, 2019 3 hours ago, cuthound said: Detector vans travel at the speed of light (according to legend) ? Detector vans? I bet you believe in Santa as well. 1 Link to comment Share on other sites More sharing options...
Sea Dog Posted March 21, 2019 Report Share Posted March 21, 2019 1 minute ago, john6767 said: I bet you believe in Santa as well. I do - he brought me a TV licence last year. Bosh!! Back on topic!! Link to comment Share on other sites More sharing options...
MtB Posted March 21, 2019 Report Share Posted March 21, 2019 12 hours ago, Sea Dog said: You can mute the spoken directions and just have the visual guidance if you prefer Mike. I often use my (built in) Nav like that, particularly on familiar journeys where I'm really only monitoring the traffic situation. I think you are missing the point. This IS how I use my satnav. Athy was proposing doing the opposite (turn off the screen and listen to the voice), and I was squabbling with him about how hopeless that would be! Link to comment Share on other sites More sharing options...
LadyG Posted March 21, 2019 Report Share Posted March 21, 2019 (edited) You will rarely convince @Athy of software versatility, but to me, it's all a bit mad. My brother got one for his numerous cars, but I've never seen him using it. Edited March 21, 2019 by LadyG Link to comment Share on other sites More sharing options...
Sea Dog Posted March 21, 2019 Report Share Posted March 21, 2019 3 hours ago, Mike the Boilerman said: I think you are missing the point. I think you're right Mike! Link to comment Share on other sites More sharing options...
TheBiscuits Posted March 21, 2019 Report Share Posted March 21, 2019 3 hours ago, john6767 said: Detector vans? I bet you believe in Santa as well. I did my high school work experience with the TV detector vans, they worked well back then. Favourite story in the office was a visit to a house where a woman was just dashing out on the school run, and told the chap in the van "Sorry I'm running late, but my husband will be back in half an hour, and our TV licence is in the top left hand drawer in the desk in the lounge." TV bloke goes back 40 minutes later. TV bloke: "Hello, TV licencing, I believe your licence is in the top left hand drawer in the desk in your lounge, may I see it please?" Husband: "F***ing Hell! I didn't know your vans were that accurate!" 1 Link to comment Share on other sites More sharing options...
LadyG Posted March 22, 2019 Report Share Posted March 22, 2019 (edited) 6 hours ago, Sea Dog said: I think you're right Mike! Mike is always right!? he tells me Edited March 22, 2019 by LadyG Link to comment Share on other sites More sharing options...
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