# The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this Art

E. Duyckinck, 1811 - Surveying - 508 pages

### Contents

 PART II 134 The Semicircle 164 The Protractor 171 Changing the scale 194 Mensuration of Areas 200
 General Method 232 Pennsylvania Method 246 Of Offsets 250 Method of surveying 257 175 175

### Popular passages

Page 38 - The angle in a semicircle is a right angle ; the angle in a segment greater than a semicircle is less than a right angle ; and the angle in a segment less than a semicircle is greater than a right angle.
Page 25 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; and each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds ; and these into thirds, &c.
Page 197 - RULE. From half the sum of the three sides subtract each side severally.
Page 106 - C' (89) (90) (91) (92) (93) 112. In any plane triangle, the sum of any two sides is to their difference as the tangent of half the sum of the opposite angles is to the tangent of half their difference.
Page 27 - The VERSED SINE of an arc is that part of the diameter which is between the sine and the arc. Thus BA is the versed sine of the arc AG.