How many times have crews had to return to the office because their EDM batteries went down? What were the chances of sending them back out with the tape or that trusty old theodolite? ![]() Now it's hard to imagine doing this work any other way. With modern EDMs, the user merely has to push a button to get a reliable distance. It wasn't until around 1980 that I got my hands on what I considered to be my first "reliable" EDM, the Topcon DMC-3. Because such instruments had to be tuned, it was possible to get a wrong answer, but, used properly, they were a wonderful invention that made a quantum leap in reducing the time necessary to obtain distances. After the Army, my next experience was with a K&E AutoRanger and then the Hewlett-Packard 3800 series. My first exposure to an EDM was in the 1960s in the Army with a Tellurometer microwave instrument. Surveyors today take electronic distance measurement for granted.
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