why don't you measure the diameter of the watch glass at the convex side?
959091
Because the curvature of the glass will falsify your measurement (light diffraction, bending of a flexible measuring tape). You have to measure edge to edge on the concave side to avoid this.
266479
Depends on how far away the wall is, don't you think, and the limits on your methods of measuring "half way"?  Eventually the difference between the distance from the center of the room to the wall and the sum of your moves will be less than your ability to measure.  That's the role of the little epsilon in the theory of limits.  Let the distance, center to wall, be D.  Then\n\nD - [(1/2)D+(1/4)D+...+(1/2^n)D]=(1/2^n)D\n\nWhen you cannot measure (1/2^n)D, you're there, for all practical purposes.\n\nTell a mathematician and an engineer they can approach the naked girl tied to the tree in this fashion [sorry, ladies, but in ancient times engineers were all male].  The mathematician will throw up his hands {so were mathematicians, with a few notable exceptions), saying, "I'll never get there."  The engineer will grin and say, "I'll get close enough."
175566
The only safe way do do it is to make a chamber cast and measure the results. There's a product called Cerrosafe, which is a low-melting metal, that you can melt in a double boiler (melts at about 180F) and pour into the chamber. As it cools it will shrink, at which point you can tap it out. Once it gets to room temperature, though, it will regain its original dimensions. Once it's completely cooled, grab a caliper or micrometer and start measuring.\n\nThe problem is that just because you know the caliber, you don't necessarily know what cartridge it takes. .38 special, .357, 9x19, 9x21, 9x23 and a few other calibers all use the same diameter bullet. Better to be safe than sorry by getting accurate information.\n\nSee the link below and search for "cerrosafe." It's on sale this week at Midway USA.
560881
Refer to the polar range of watches. I have one they are absolutely great. Go on ebay and you can choose all the functions you are after. They start basic and work there way up to mini computers. \n\nGood luck!
713361
It is unlikely that you will have any measurement on the drawing that is related to a radius by pi. You double the radius to get the diameter, and multiply that by pi to get the circumference, but you are very unlikely to get a drawing in which the circumference is given, but not the radius. The radius is the gap you would set on your compasses to draw the circle. If you did need to design a wheel of a given circumference, maybe for a gearbox,  then you would divide by 2pi to get the radius needed.
128931
Your attachment is way too big. Remove your glasses and try again.
1000825
Sell the barometer and use the money to hire someone to find the answer.\n\nFind a point a which the barometer and the building have the same apparent height. Measure the distance from from eyeball to the barometer and the distance from your eyeball to the building. The ratio of the distances will equal the ratio of the heights. \n\nAt least I tried to give original answers!
1139471
Yeah where's angle 1 and 2.\nBut remember the angle opposite the longest side has the greastest measurement.
493713
See it through a magifying glass. it will look 'BIGGER'
98513
I have a Breitling watch that was made for Bentley worth a lot of money, dont ask how I got it though... I think you can only get that model in the European countries
720092
While the answers above are correct, I will go a bit further.\n\nEstes rockets sells a nice tool for just this very job that will make your measurement fairly easy and accurate. It is called AltiTrak (TM).\n\nhttp://www.estesrockets.com/cgi-bin/products.cgi?view,296
1098468
If you are measuring something with a round cross section, make sure that the axis of the object is perpendicular to the caliper. This is necessary to ensure that you are measuring the full diameter and not merely a chord.
771219
Hi there.....It might be an allergic reation to the nose-ring you are using. Our bodies act differantly to new and foreign objects. If you feel you have given it enough time to get use to it then you might want to go with a sergical steel or plastic. My sister has always had a problem with watches. If the back of the watch touches her skin the battery dies. Crazy but true. Just another fact proving we are all different. LOL. Hope this helps in some way. Good luck! Cowgirl
843492
depending on how big the glass is!!! do the math!!!
724886
You can get measuremnts at 1000th of an inch from following page\n\nhttp://www.onlineconversion.com/ring_size.htm
691753
maybe a hexagonal prism http://en.wikipedia.org/wiki/Hexagonal_prism http://en.wikipedia.org/wiki/Prism_%28geometry%29
646733
glass has the property to transmit light from one side to the other side of it. other objects stop the light..or atleast do not pass the light fully.. thats why glass is tranparent to the other side