Don't even bother! The "level" on your transit takes care of that for you. In actual happenings, if your concrete floor is level on one side and you move 20 feet to the other side and level it there then the two surfaces will not be parallel. The level will be tangent to the earth on the one side and tangent to the earth on the other side.... both sides perpendicular to lines that are not parallel to each other as they converge at the center of the earth. Think of it this way. Check your level where you're located and then in your mind go 1/4 the way around the earth and check it again. It will be 90 degrees from the plane you held it at on your first check. Go half way around the earth and the level will be parallel but will be rotated 180 degrees from it's first check. BUT, still level. All I can say is, "Thank God for gravity. It seems to work very well!"
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Today's Featured Article - A Towny Goes Plowing - by Anthony West (UK). I live in an area renowned for its rural beauty. Small fields with hedgerows and trees are common place, as are small hamlets with village greens and the odd duck pond complete with swans. The center of any village once the shop is closed is the old tavern. Rustic places with cheerful names like "The Griffin" "Red Lion" or "The Plough and Harrow" are found dotted around the country lanes all over the place. The warm glow of yellowish light can be seen for quite some distance at dusk, and
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