## Elements of Surveying and Leveling: With Descriptions of the Instruments, and the Necessary Tables |

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Page 163

**About twenty - five minutes before the time of the greatest eastern or western elongation of the pole - star , as shown by the**tables of elongations , let the theodolite be placed at a convenient point and levelled .### What people are saying - Write a review

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### Common terms and phrases

adjusted angle apply axis base bearing calculated called centre chain column compass convenient corresponding Cosine Cotang course curve decimal departure describe determined difference direction distance divided draw drawn east equal error example extremity feet field figure given gives ground half height hence horizontal horizontal plane inches intersection known land latitude length less limb logarithm manner marked means measured meridian method necessary notes object observed offsets parallel passing perpendicular plate plot position principal radius reading recorded reference represent result rule scale screws side sights Sine slope square stakes station subtract suppose surface survey taken Tang tangent telescope theodolite traverse triangle true turn vernier vertical yards

### Popular passages

Page 56 - ... the square of the hypothenuse is equal to the sum of the squares of the other two sides.

Page 12 - The logarithm of any power of a number is equal to the logarithm of the number multiplied by the exponent of the power.

Page 15 - 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.

Page 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.

Page 12 - The logarithm of a quotient is equal to the logarithm of the dividend minus the logarithm of the divisor.

Page 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...

Page 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.

Page 11 - The logarithm of the product of two numbers is equal to the sum of the logarithms of the numbers.

Page 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.

Page 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.