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Two plastic syringes and a length of aquarium tube, filled with water, make a press that lifts twenty pounds of hardbacks under a gentle push from one thumb. It costs about ten dollars. Your thumb travels forty-seven millimetres and the books rise ten, and that trade is the whole of the subject.
This book takes that rig to the excavator, the brake on your car, the aircraft flight control and the factory floor. You will measure the compressibility of water and fail, which is the point. You will find out why your brake pedal goes soft when there is air in the line and firm when there is not, and be able to work out from first principles how one foot on a pedal generates fourteen thousand newtons at four wheels.
It also covers the firms that made high-pressure hydraulics cheap and reliable enough to buy on a hobby budget, from Vickers and the balanced vane pump to Poclain, Caterpillar, Case and JCB, because you cannot understand why a modern circuit is shaped the way it is without knowing which problem each part of it was invented to solve.
And it is blunt about the two failures in this subject that kill people, and how to work so that neither one happens to you.
Twenty-five chapters, sixty-eight drawn figures, and costed bench experiments throughout. Blaise Pascal is on the cover. Every measurement is given in both metric and imperial. The complete book is free at benchdegree.com.
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