It seems to be one of the best equalizers. There are two different scales at these levels. One for the side (back of the bus) and the other for the front back (side of the bus). The reason there are different scales is that they are more or less calibrated in inches. For example, with simple trigonometry, you can determine how many inches a car is off level by simply using the right angle formula and solving for one side. . The input values are the angle (determined by the plane) and the distance from the plane to the point where you want to know how many inches of buoyancy you need. For a horizontal plane, 1 inch marks are pretty accurate. as long as you place the scale in the center of the cart, as most carts are less than an inch or two wide. The result varies greatly depending on the length of the car. Using this level on an 18ft car will give a completely different measurement than, say, a 35ft car. rear), then the two ends of the car will be different. For example, if the spirit level is in the center, then a height of 1 inch from the spirit level means 1 inch in front or behind. if the level is off center, then a 1 inch level reading might actually be 1/2 inch on one end and 1 1/2 inch on the other end. Again, this is simply the principle of right angles in trigonometry. Also, do not rely on the adhesive backing as it may shift over time. As difficult as it may be for you, your best bet is to drill a few holes and screw the levels in.
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