WD-40 How does it know?

geoffatstanpit

geoffatstanpit

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If the outboard won't start you squirt WD-40 on the plug and lead to stop the volts leaking away. If the masthead light doesn't work you squirt WD-40 on the plug and socket to help the volts get through. How does it know whether to insulate or conduct?
 
It doesn't /forums/images/graemlins/smile.gif it simply displaces water /forums/images/graemlins/smile.gif
 
Next question - a mirror reverses the image side-to-side but not top to bottom yet if you turn it on its side it still does the same. How does it know which way is up?
 
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Next question - a mirror reverses the image side-to-side but not top to bottom yet if you turn it on its side it still does the same. How does it know which way is up?

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Simple - it's because the images on your retinae are actually upside down to start with.
 
Equatorial mirrors just make me look fat, how do they know????
After having read you are lighter at the equator .......due to centrifugal fling or some such , but thebl88dy mirrors dont read the same science mags as me.
On reflection------
 
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It doesn't /forums/images/graemlins/smile.gif it simply displaces water /forums/images/graemlins/smile.gif

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Yup - Water Displacement (40th attempt) - the inventor got the formula right eventually.
People in Lincolnshire have been using this stuff on their arthritic knees - and it works ...

I kid you not.
Colin
 
Simple - it's because the images on your retinae are actually upside down to start with.

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Not really. The subject of much discussion for years. I think the easiest way to look at it is to remember that the image is also reversed in the direction of subject to mirror.
 
"People in Lincolnshire have been using this stuff on their arthritic knees - and it works ..."

Colin.. I've heard some people on Fenside drink it as well /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif

Another Boston resident!

Tim
 
place the mirror in front of you, the way they're used normally. Then the simple answer is that they don't reverse left and right. Look in a mirror and wave your right hand. On which side of the mirror is the hand that waved? The right side, of course. Get some large R and L letters. Hold the R in your right hand so that it's the correct way around for you to recognise it. Do the same for the L, holding that in your left hand. Now ask what you see in the mirror. The R is still on the right hand side of the mirror!
 
Re: WD-40 How does it know?

Another one on mirrors, or lenses rather. When reading old salty novels one is made to understand that in old times the image in night view glasses was upside down? Why? Fewer lenses to let more light through? Or what?
 
Yup it's right. The reason you think it's wrong is that the image you see in a mirror or yourself seems reversed laterally, but in fact the only other images of yourself you will have seen will be photos, which are taken by someone with a different perspective to you. ie: facing the opposite way to you.

The same works for mirrored lettering. The text that appears backwards in a mirror is probably behind you (number plates on cars behind). If you turn around to look at them you have altered your point of perspective and they read (as you recognise them) correctly.

You will also probably run into the car in front. /forums/images/graemlins/grin.gif
 
Drifting the thread even more ...
my car has a camera in the back so I can see where I am reversing - the image displays on the GPS screen as soon as I select Reverse (it is SOOOO much fun reversing to within an inch of an expensive car while the owner is looking on, horrified, while I seem to be looking at the radio!).

It was several months before I realised the image was "reversed". Looking at the screen is like looking in a mirror - it is not like looking straight through a camera viewfinder. I think it took several months to figure this out because it seemed so natural - facing forward, looking forward at an image from the back of the car - just like a mirror. In fact I only realised it when I reversed towards some signage and couldn't read it.
 
They must have reversed the image on purpose. It figures I suppose.
They have matched the image you get from your door mirrors.
If a brick wall appeared on the left of you screen, but was in reality on the right of the rear of the car you may well steer into it rather than away.
 
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