Surveying and Levelling Instruments, Theoretically and Practically Described. For construction, qualities, selection, preservation, adjustments, and uses; with other apparatus and appliances used by civil engineers and surveyors in the field.

CHAPTER VI.

Chapter 628 wordsPublic domain

DIVISION OF THE CIRCLE AND METHODS EMPLOYED IN TAKING ANGLES:-- Dividing Engine--Surfaces for Graduation--Vernier--Various Sections--Reading Microscopes--Shades--Micrometers--Clamp and Tangent Motions--of Limbs--of Axes--Use and Wear--Difference of Hypotenuse and Base 175