Later its activities were expanded to include establishment of control monuments throughout the country. Initially its charge was to perform hydrographic surveys and prepare nautical charts. Coast and Geodetic Survey was established by an act of Congress in 1807. The need for maps and location of national boundaries caused England and France to make extensive surveys requiring accurate triangulation thus geodetic surveying began. In the 18th and 19th centuries the art of surveying advanced more rapidly. Any tube that must be up and down or centered over something on the bottom, use this tool to do that.Geodesy (/dʒiːˈɒdɨsi/), also named geodetics, is the scientific discipline that deals with the measurement and representation of the Earth. The plumb bob is used for vertical alignment. The more you use the string line tool the more you will find it can do. That ensures that all the tabs are at the same height, same angle, and fairly precise. Then with our universal tab positioner set the tab to just barely match the string. Run the string from tube to tube and make it nice and tight. When attaching tabs to a frame to support a sheet metal panel, it’s important to make the tabs all on the same plane. Simply run the string from one tube to the other and attach the bubble level. If you need tubes to be the same on the left and right sides of the car or from front to back, the string line and bubble level can tell you if one tube is higher or lower than the other.
There’s more! Adding a bubble level to the string allows us to see if things are slanted. If you have a tube notching machine you can set the angle of that machine using this method. That angle is the angle the tube must be cut to in order to fit correctly. Then using an angle finder, you can measure the strings angle as it sits. The string is ran from one point to another and held in place with magnets. For example you can use the magnets and the string to measure the angle any tube needs to be in the frame or roll cage. With the use of other tools it can make angle measurements. But the string line can do so many more things. Modern laser alignment systems will do this job faster and better but for us DIY folks, the string is the best way to do that task. A good example is when we need to do a wheel alignment on our race car. Sometimes we need something straight as a reference. When you pull a string tight against two points it makes a near perfect line. How String Builds a Straight Race Car Chassis and Strong Roll Cage The only major changes to our tools sense ancient Egyptian times is the use of modern materials and magnets. We use the string line tool on our builds in many different ways. And it has lasted the test of time for good reason. Earliest records show them being used to make the pyramids in Egypt.
The string line and plumb bob tools have been in use for thousands of years. Old Tools New Projects, Even the ancient Egyptians used these tools
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