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Grove r
05-11-2001 21:09:05
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Re: Re: Another Survey Instrument Question. in reply to Paul, 05-11-2001 14:49:28
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Hi, Paul, first, am not a surveyor, so what transcribes is strictly in laymans terms, secound, thanks for the response, very much appreciated. To add a little more to my first post; the instrument mentioned was used in the oil exploration industry, [siesmograph], for ploting elevation and direction. the system incorporated a tripod, to which was atached a "board", center mounted, of about 18in. square. attached to this is a piece of light cardboard, whith four special corner screws. The instrument is made up of the usual veiwing apperatus mounted on a flat base, app. four by ten inches by 1/4 inch thick beveled on the sides with graduations as a ruler would have. the "veiwer" was able to pivot up and down for elevation[?], and also was equiped with triangulation feature, and leveling atachment. the unit rested on the "board" freely, able to be moved about. From what I remember; after chaining and "flagging" the "line", sometimes many miles long, surveying would take place in the usual maner, writing the elevations etc. down in a book, but where the difference came in, was the fact that an actual map was drawn to scale on the "cardboard", as surveying was carried out. Have often thought about this as I have never seen this type of survey tool used before or since, hence my queery on the previous post. Perhaps this is not the proper place for this question, but due to the vast store of knowledge here, knew that someone would surely be able to shed some lite on the subject. thanking you again for you response, R.E.L.
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