{"language": "en", "segments": [{"text": " Speed and still more speed. The breathtaking speed of the past is", "start": 9.78, "stop": 14.86, "id": 0}, {"text": " just poking along today.", "start": 14.86, "stop": 16.46, "id": 1}, {"text": " Faster trains, faster trucks and motor cars speed up the work and play of the", "start": 17.26, "stop": 22.22, "id": 2}, {"text": " world. Each increase in speed follows the winning of a skirmish with", "start": 22.22, "stop": 27.76, "id": 3}, {"text": " speed's greatest enemy, friction.", "start": 27.76, "stop": 30.16, "id": 4}, {"text": " And yet, strange as it might seem, speed is limited to our ability to stop and", "start": 31.08, "stop": 37.26, "id": 5}, {"text": " stopping depends upon friction. What a paradox. Do away with friction for more", "start": 37.26, "stop": 43.44, "id": 6}, {"text": " speed and yet for more speed add friction. Whether you travel on a", "start": 43.44, "stop": 50.4, "id": 7}, {"text": " bicycle, a wagon or the fastest planes or cars, friction protects", "start": 50.4, "stop": 57.04, "id": 8}, {"text": " you and your safety depends upon brakes which apply friction for stopping.", "start": 57.04, "stop": 63.96, "id": 9}, {"text": " In modern busy traffic, on congested city streets, on the crowded highway or in", "start": 64.88, "stop": 70.18, "id": 10}, {"text": " speeding along on the straight open stretches, the safety of men, women and", "start": 70.18, "stop": 75.52, "id": 11}, {"text": " children depends upon brakes. No better example of dependable brakes can", "start": 75.52, "stop": 82.46, "id": 12}, {"text": " be found than those manufactured by the Chevrolet Motor Company.", "start": 82.46, "stop": 86.88, "id": 13}, {"text": " This is the Chevrolet wheel and brake. Notice how smoothly the wheel comes to a", "start": 87.94, "stop": 93.3, "id": 14}, {"text": " stop with the slightest pressure on the pedal and how quickly the wheel stops", "start": 93.3, "stop": 97.3, "id": 15}, {"text": " when a sharp pressure is applied.", "start": 97.3, "stop": 99.32, "id": 16}, {"text": " Before we can appreciate the degree of perfection Chevrolet has reached in its", "start": 99.86, "stop": 104.82, "id": 17}, {"text": " brakes, we must understand how friction is used, what its habits are and what", "start": 104.82, "stop": 110.92, "id": 18}, {"text": " must be done to take full advantage of it. This", "start": 110.92, "stop": 117.6, "id": 19}, {"text": " is a motor car wheel and to this wheel is fastened a brake drum, the part", "start": 117.6, "stop": 124.44, "id": 20}, {"text": " to which friction will be applied for stopping. Since friction produces heat, the", "start": 124.44, "stop": 130.76, "id": 21}, {"text": " material used for applying friction must resist heat. If it doesn't, it will", "start": 130.76, "stop": 136.58, "id": 22}, {"text": " smoke, char, burn and quickly wear out.", "start": 136.58, "stop": 142.24, "id": 23}, {"text": " Chevrolet with every available brake material to choose from through exhaustive", "start": 145.24, "stop": 150.52, "id": 24}, {"text": " tests has selected the very best for Chevrolet brakes. But regardless of", "start": 150.52, "stop": 157.48, "id": 25}, {"text": " the quality of the material, the way this material is used is more important. For", "start": 157.48, "stop": 162.9, "id": 26}, {"text": " example, the amount of braking material in contact with the brake drum largely", "start": 162.9, "stop": 167.66, "id": 27}, {"text": " determines how long the material will last and how effective and safe the brakes", "start": 167.66, "stop": 174.16, "id": 28}, {"text": " are. Look at this, this motor car wheel is spinning and the brake drum turning", "start": 174.16, "stop": 180.5, "id": 29}, {"text": " with it. A short brake shoe covered with brake material will be used to stop this", "start": 180.5, "stop": 185.62, "id": 30}, {"text": " wheel. Now watch, see how hot the brake shoe gets and how quickly the brake", "start": 185.62, "stop": 192.02, "id": 31}, {"text": " material is ground away? The brake shoe is lengthened, the brake shoe doesn't get", "start": 192.02, "stop": 198.72, "id": 32}, {"text": " so hot and the brake material lasts longer.", "start": 198.72, "stop": 202.32, "id": 33}, {"text": " A still longer and now almost half of the drum is covered with friction", "start": 210.14, "stop": 216.98, "id": 34}, {"text": " producing brake material and the wheel is brought to a stop with very little heat", "start": 216.98, "stop": 222.38, "id": 35}, {"text": " or wear. It is a simple matter to see that the effectiveness of brakes and their", "start": 222.38, "stop": 228.98, "id": 36}, {"text": " durability depend to a large extent upon the amount of braking material in", "start": 228.98, "stop": 235.04, "id": 37}, {"text": " contact with the revolving brake drum and the amount of braking material in", "start": 235.04, "stop": 240.22, "id": 38}, {"text": " contact with the brake drum not only depends upon the length and number of the", "start": 240.22, "stop": 245.54, "id": 39}, {"text": " shoes but upon the diameter and the width of the brake drum. Imagine", "start": 245.54, "stop": 252.34, "id": 40}, {"text": " a Chevrolet brake without articulated brake shoes, a brake which from all outward", "start": 252.34, "stop": 258.54, "id": 41}, {"text": " appearances applies plenty of brake material to the brake drum. But notice this,", "start": 258.54, "stop": 264.28, "id": 42}, {"text": " the ends of the brake shoes are fastened to fixed pivots. Watch as they move", "start": 264.74, "stop": 271.42, "id": 43}, {"text": " about these fixed points that the end of the shoe moves farther than the part", "start": 271.42, "stop": 276.32, "id": 44}, {"text": " near the pivot. As long as the surface of the brake forms a perfect circle and as", "start": 276.32, "stop": 282.44, "id": 45}, {"text": " long as the pivot is located in exactly the right place then all the brake", "start": 282.44, "stop": 287.42, "id": 46}, {"text": " material will contact the brake drum. But you can't use the brakes without making", "start": 287.42, "stop": 294.08, "id": 47}, {"text": " heat and heat changes the shape of the brake shoe. See this shoe doesn't fit the", "start": 294.08, "stop": 300.86, "id": 48}, {"text": " drum anymore, the rigid pivot won't let it so only part of the brake material", "start": 300.86, "stop": 305.72, "id": 49}, {"text": " contacts the brake drum and the part that does wears down first. When the brake", "start": 305.72, "stop": 312.02, "id": 50}, {"text": " shoe cools off then here's what you get. Now only the ends of the brake shoes", "start": 312.02, "stop": 318.02, "id": 51}, {"text": " touch the drum and only parts of the braking material are in contact with the", "start": 318.02, "stop": 322.82, "id": 52}, {"text": " drum. This is a Chevrolet wheel and its large brake drum 12 inches in diameter.", "start": 322.82, "stop": 329.42, "id": 53}, {"text": " These are Chevrolet brake shoes. Notice how long they are, how much of the inside", "start": 331.1, "stop": 336.56, "id": 54}, {"text": " surface of the brake drum they cover. But even more important notice how these", "start": 336.56, "stop": 342.24, "id": 55}, {"text": " shoes are supported. Instead of a single pivot for each shoe, each shoe swings on", "start": 342.24, "stop": 348.06, "id": 56}, {"text": " a link with two pivots each. Notice too that each shoe can move as it wants to", "start": 348.06, "stop": 353.52, "id": 57}, {"text": " and should within the circle of the brake drum. There is nothing to prevent each", "start": 353.52, "stop": 358.22, "id": 58}, {"text": " shoe from exactly fitting the brake drum whether it's hot or cold. Now notice", "start": 358.22, "stop": 363.32, "id": 59}, {"text": " that this simple little piece as it turns spreads the outer ends of the shoes", "start": 363.32, "stop": 368.44, "id": 60}, {"text": " apart. As the brake operates every square inch of braking material hugs the brake", "start": 368.44, "stop": 374.52, "id": 61}, {"text": " drum. Every square inch of braking material wears exactly the same. This", "start": 374.52, "stop": 381.24, "id": 62}, {"text": " is one of the reasons why Chevrolet brakes work so easily, so effectively and", "start": 381.24, "stop": 387.46, "id": 63}, {"text": " they stay in adjustment over thousands and thousands of miles of the hardest", "start": 387.46, "stop": 392.06, "id": 64}, {"text": " driving through the heaviest traffic and through any kind of weather. Regardless", "start": 392.06, "stop": 397.68, "id": 65}, {"text": " of how well a brake is designed, its moving parts must be protected from water,", "start": 397.68, "stop": 404.06, "id": 66}, {"text": " slush, mud, dirt, sand, dust, and grit. If they aren't, they", "start": 404.84, "stop": 411.64, "id": 67}, {"text": " can't stand up. This is why Chevrolet protects the interior of its brakes", "start": 411.64, "stop": 418.52, "id": 68}, {"text": " with this close-fitting shield and in addition protects the bearing parts against", "start": 418.52, "stop": 424.7, "id": 69}, {"text": " rust by plating them with experienced engineers in General", "start": 424.7, "stop": 431.48, "id": 70}, {"text": " Motors Laboratories and the Chevrolet Engineering Department, Chevrolet has its", "start": 431.48, "stop": 436.7, "id": 71}, {"text": " choice of every available means for connecting brake pedals with brakes. After", "start": 436.7, "stop": 443.14, "id": 72}, {"text": " all, why should there be a problem in connecting four mechanical brakes with one", "start": 443.14, "stop": 449.68, "id": 73}, {"text": " foot operated pedal? Simplicity is always a thing to be solved, particularly", "start": 449.68, "stop": 455.88, "id": 74}, {"text": " where safety is at stake. So Chevrolet with four strong", "start": 455.88, "stop": 462.7, "id": 75}, {"text": " steel rods and four strong steel cables through a strong sturdy cross", "start": 462.7, "stop": 469.46, "id": 76}, {"text": " shaft and link connected its four mechanical brakes mechanically with the foot", "start": 469.46, "stop": 475.86, "id": 77}, {"text": " operated pedal. What could be simpler? What could be safer? A 300 pound man", "start": 475.86, "stop": 482.52, "id": 78}, {"text": " standing on a Chevrolet brake pedal could not even spring a single part in the", "start": 482.52, "stop": 487.58, "id": 79}, {"text": " entire brake system and the reason is simple, the steel cables are of the same", "start": 487.58, "stop": 492.86, "id": 80}, {"text": " material used to lift heavy freight elevators for operating steam shovels and for", "start": 492.86, "stop": 498.32, "id": 81}, {"text": " supporting suspension bridges. In fact, here's an entire Chevrolet car hanging on", "start": 498.32, "stop": 504.2, "id": 82}, {"text": " just one of Chevrolet's brake control cables. Chevrolet's brake rods", "start": 504.2, "stop": 510.58, "id": 83}, {"text": " have a tensile strength of over 3,000 pounds and the cross shaft and link", "start": 510.58, "stop": 517.1, "id": 84}, {"text": " is many times stronger than required. Is it any wonder that Chevrolet owners", "start": 517.1, "stop": 523.6, "id": 85}, {"text": " speed along without any thought of brakes? The heaviest of traffic doesn't faze", "start": 523.6, "stop": 528.96, "id": 86}, {"text": " them for they know from experience that they're cable controlled. All mechanical", "start": 528.96, "stop": 534.52, "id": 87}, {"text": " brakes are on the job every instant ready for any emergency at the slightest push", "start": 534.52, "stop": 541.5, "id": 88}, {"text": " on the foot pedal smooth safe brakes that stay in adjustment for thousands of", "start": 541.5, "stop": 547.22, "id": 89}, {"text": " miles of safe travel and all of this due to Chevrolet engineers", "start": 547.22, "stop": 553.78, "id": 90}, {"text": " knowledge of friction the enemy of speed and yet the", "start": 553.78, "stop": 559.98, "id": 91}, {"text": " friend of speed.", "start": 559.98, "stop": 561.78, "id": 92}]}