# Elements of Surveying and Levelling: With Descriptions of the Instruments and the Necessary Tables

A. S. Barnes, 1871 - 431 páginas

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### Contenido

 BOOK 9 Multiplication by Logarithms 17 SECTION II 23 Sectoral Scale of Equal Parts 29 Definitions of the Trigonometrical Lines 39 Theorems 44_47 47 Solution of RightAngled Triangles 5657 56 Standard of Measure 65
 Public Lands 153157 153 To find the true Meridian 162 Uses of the Theodolite 170173 170 Plotting Work 181 BOOK III 190 Levelling Rods 196 Definitions and Principles 208 SECTION III 219

### Pasajes populares

Página 56 - ... the square of the hypothenuse is equal to the sum of the squares of the other two sides.
Página 12 - The logarithm of any power of a number is equal to the logarithm of the number multiplied by the exponent of the power.
Página 13 - The minutes in the left-hand column of each page, increasing downwards, belong to the degrees at the top ; and those increasing upwards, in the right.hand column, belong to the degrees below.
Página 37 - 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, etc.
Página 12 - The logarithm of a quotient is equal to the logarithm of the dividend minus the logarithm of the divisor.
Página 10 - When a number lies between 1 and 10, its logarithm lies between 0 and 1; that is, it is equal to 0, plus a decimal; if a number lies between 10...
Página 9 - The logarithm of a number is the exponent of the power to which it is necessary to raise a fixed number, in order to produce the first number.
Página 11 - The logarithm of the product of two numbers is equal to the sum of the logarithms of the numbers.
Página 130 - MC; hence, the double meridian distance of a course is equal to the double meridian distance of the preceding course, plus the departure of that course, plus the departure of the course itself : if .there is no preceding course, the first two terms become zero.
Página 38 - The secant of an arc is the line drawn from the centre of the circle through one extremity of the arc, and limited by the tangent passing through the other extremity. Thus, 00 is the secant of the arc AB.