A treatise on surveying ; in which the theory and practice are fully explained (1860)
Alsop, Samuel · Philadelphia, E. C. & J. Biddle & co. · leaf 53
uler against one of the other sides.Slide the triangle along the ruler until the point C is inthe side which before coincided with the line: this side isthen parallel to the given line. The parallel rulers which accompany most cases of in-struments are theoretically accurate. They are,… … Sec. II.] DRAFTING OR PLATTING. 51 Fig. 35.
Surveying
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