The manuals published by W. & L.E. Gurley, one of America’s leading producers of mathematical and scientific instruments, have been used by generations of engineers and surveyors.

In this manual Gurley describes all of its various instruments: how they are calibrated, used and maintained, and includes a catalog of its complete instrument line. This 1874 edition is especially valuable since it is one of the earliest and is rarely found. With an introduction by David C. Garcelon.

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