The metal tip is exactly 1/16 of an inch thick. This isn’t an error: it’s meant to provide you with accurate readings whether you’re measuring the inside or outside edge of a surface. The first inch of the tape is short by 1/16 of an inch. The metal tip at the end of your tape measure is a little bit loose for a reason. If you’re measuring something and don’t have a marking tool handy, you can use this serrated edge to make a mark by running it back and forth on whatever you’re measuring. THE SCRIBING TOOLĭid you ever notice that the bottom of the end hook of your measuring tape has a serrated edge? There’s a good reason for that. This way, if you’re measuring a flat surface and don’t have anyone to hold the other end of the tape, you just need to hammer in a nail or insert a screw and hook the end of the tape onto it to get a clear and accurate measurement. It’s there to grab onto the end of a nail or screw. On nearly every measuring tape, you’ll find a small slot on the end hook. Those diamond marks are there for builders who want to take advantage of the great strength of engineered I-beams by using fewer floor joists, with no loss of floor support. If you multiply these dimensions by 8, 6, 5, and 4, respectively, you’ll find each comes to 96”, the length of the plywood panels used for sub-flooring. Span tables for these beams provide ratings for spacings of 12”, 16”, 19 3/16”, and 24”. Because these beams can support more weight than their dimensional lumber counterpart, they often have different spacing requirements. The diamond marks on tape rule blades are for spacing these engineered floor joists in new construction. The black diamonds which appear every 19 3/16” on metal tape measures are for spacing I-beam “timbers.” Several wood-product manufacturers offer I-beam “timbers” as a substitute for solid lumber floor joists. This curve allows the blade to “stand out” while measuring, helping you read the measurement. Have you ever wondered why the blade on a tape measure is curved? The concave design helps keep the blade rigid when extended. Here are a few hidden features you will find within your tape measure. After all, a measuring tape is a simple device with a simple – although important – purpose: to measure things.īut there’s more to this tool than meets the eye. This option is not given in the choices, so there might be a mistake in the question or the given options.Are you getting the most out of your tape measure? The standard error of the area plot is approximately 2.50 m². Calculate the standard error of the area: To find the standard error of the area, we need to multiply the combined relative standard error by the area. Since the area is the product of length and breadth, we can add the relative standard errors.Ĭombined relative standard error for area = (1/4500) + (1/1750)ģ. Now, we need to find the combined relative standard error for the area. The relative standard error is the standard error divided by the measurement. First, we need to find the relative standard error for both length and breadth.
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