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

E. Duyckinck, 1811 - 508 páginas

### Contenido

 Trigonometry 101 ments 122 PART II 134 The Semicircle 164 The Protractor 171 Mensuration 179
 Mensuration of Areas 200 Of Offsets 250 Method of surveying 257 Changing the scale 266 474 134 175 175

### Pasajes populares

Página 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.
Página 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.
Página 197 - RULE. From half the sum of the three sides subtract each side severally.
Página 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.
Página 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.