The theory and practice of surveying. Designed for the use of surveyors and engineers generally, but especially for the use of students in engineering (1886)
Johnson, J. B. (John Butler), 1850-1902 · New York, J. Wiley & sons · leaf 197
led, from 8 to 14inches in diameter, graduated to half or quarter degrees.They are printed from engraved plates on drawing- or tracing- 168 SURVEYING. paper or bristol-board, and are very convenient for plottingtopographical surveys. The map is drawn directly on theprotractor sheet, the bearing of… … Fig. 47. angular graduations on its circumference, or sides, and dividedover its face by horizontal and vertical lines, like cross-sectionpaper. A movable arm can be set by means of a vernier toread minutes of arc, this arm being also graduated to readdistances from the centre outward. Having set…
Surveying
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