A treatise on land-surveying; comprising the theory developed from five elementary principles; and the practice with the chain alone, the compass, the transit, the theodolite, the plane table, &cIllustrated by four hundred engravings, and a magnetic chart . uth line may be parallel to one of the sides of theboard. The inner side of the stock of the T square bemg pressedagainst one of the other sides of the board and slid along, the edgeof the long blade of the square will always be parallel to itself andto the first named side of the board, and will thus represent themeridian passing through a
A treatise on land-surveying; comprising the theory developed from five elementary principles; and the practice with the chain alone, the compass, the transit, the theodolite, the plane table, &cIllustrated by four hundred engravings, and a magnetic chart . uth line may be parallel to one of the sides of theboard. The inner side of the stock of the T square bemg pressedagainst one of the other sides of the board and slid along, the edgeof the long blade of the square will always be parallel to itself andto the first named side of the board, and will thus represent themeridian passing through any station. :hap. IV.] Platting the Survey. 159 If a sti-aight-edged drawing Fig. 180. board or table cannot be pro-cured, nail dovra on a table ofany shape a straight-edged ru-ler, and slide along against itthe outside of the stock of a Tsquare, one side of the stockbeing flush with the blade. A parallel ruler may also beused, one part of it beingscrewed down to the board inthe proper position. If none of these means are at hand, approximately parallel meri-dians may be drawn by the edges of a common ruler, at distancesapart equal to its width, and the diameter of the protractor madeparallel to them by measuring equal distances between it and (266) To plat a survey with these instruments, mark, with a finepoint enclosed in a circle, a convenient spot in the paper to repre-lent the first station, 1 in the figure. Its place must be so chosen Fig. 181.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectsurveying, bookyear18
