There are two pretty good ways to weigh a car: Drive it to the nearest public weighbridge and wait your turn. Look up the manual under General Specifications, ‘kerb weight’ But let's suppose the nearest public weighbridge is fifty miles away and you've lost the manual (and temporarily forgotten how to use public libraries and the Internet) and the burning urge to weigh your car just won't go away- what can you do about it? The good news is, you need hardly any equipment. All you need, for a reasonably accurate result is: a hand-held tyre pressure gauge which can be analogue or digital a retractable steel measuring tape a calculator, pencil and paper, or a good head for mental arithmetic The method Park the car on some clean, level concrete Observe that the car is held up by its four tyres (!) Measure the width of the tread of one tyre: e.g. 6 inches Measure the length of tread in contact with the ground: e.g. 7 inches Work out the area of tread touching the ground: e.g. 6 x
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The triode was invented in 1906 by Lee De Forest and by around 1920 was refined enough to be commercially viable for widespread distribution. It was the World's first 'Active Device'. It could amplify and oscillate. It (and its derivatives) made possible all of the technologies of modernity – public address, radio, audio/video recording, television, radar, radio telescopy, electron microscopy, computing, the Internet, artificial intelligence. Without active devices, modernity would vanish in a flash. Those who really want to turn the clock back need only abandon science, technology and education. Nature will do the rest.