Good references in case you’re interested in further reading: The topic of instrumentation precision/accuracy is covered in most engineering curriculua through your stats class (though since it’s usually taught by a statistics professor instead of an engineering professor, I doubt most engineering students even realize it). Your average station master or engineer would then compare off that standard. Now, for the early days of railroad, I imagine major railroads actually had a central office that established this standard. The mean becomes your “standard” that all other accuracy is measured against. So if we were talking atomic clocks, you get a bunch of atomic clocks together and perform a statistical analysis on them to calculate the “average deviation”- this gives you the precision of your measuring instrument. Posted in Science Tagged piezo, piezo effect, quartz crystal Post navigationĮxcellent question! A (very) oversimplified answer is that you conflate “accuracy” with precision of the best instruments you have to measure the standard (if it has a physical standard). But this is a nice set of demos and fun to watch. We also talk about practical applications of quartz crystals pretty regularly. If you think you know about flip flops, by the way, you may find the end of the second a bit surprising, and quite the unusual use of flip flops. The fact that the crystals replaced actual tuning forks inside watches shows how far things have changed in the last 50 years. It would be a great thing to do for a science class. We really liked the steel rule demonstration in the second video. In particular, he looks at how a little crystal that vibrates at 32,768 Hz can make a watch. If you think you don’t care about barbecue lighters, reminds you that the same effect is what makes the quartz crystals we use in crystal oscillators work. Using some computer animations and some peanut butter lids he shows you exactly why compressing the crystal generates electricity. But after that gets into the crystal lattice structure of quartz. The first two minutes is a recap of things you already know. has one, but he didn’t understand the physics behind why it works, so he decided to do the research and share it in a video. Matches are old school, and you are more likely to use a piezoelectric lighter to start your grill. Summer in the Northern hemisphere means outdoor cooking.
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