The theory and practice of surveying : containing all the instructions requisite for the skilful [sic] practice of this art, with a new set of accurate mathematical tables
A surveying textbook by Robert Gibson and James Ryan, published in New York by Harper in 1832 for students and practitioners of land measurement. The single plate is a sepia engraving of a mechanical instrument, rotated sideways on the page, with a drum-shaped body, a bracket-mounted arm, and lettered reference marks beside it. A designer might take its crisp mechanical linework and the sideways page layout as a model for technical diagrams.
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