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

### From inside the book

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Page 29

... the fi st quotient , being added to the Logarithm of its next lesser number , will give the Logarithm sought ,

... the fi st quotient , being added to the Logarithm of its next lesser number , will give the Logarithm sought ,

**true**to 8 , or 9 places ; and therefore it will be very easy to examine any suspected Logarithm in the Tables . Page 98

This is

This is

**true**, except the two first or two last terms of the proportion are on the line of tangents , and neither of them under 45 ° ; in this case the extent on the tangents is to be made in a contrary direction : For hid the tangents ... Page 149

... CD is

... CD is

**true**, let the measure of the angle CHD be taken by the line 00 , with the chain : if this angle corresponds with its containing sides , the length of the line DC is truly obtained , and the whole work is truly taken . Page 167

... and look backward through the sights ; if you then see the object in the first station , the table is fixed right , and the needle is

... and look backward through the sights ; if you then see the object in the first station , the table is fixed right , and the needle is

**true**; if not , turn the table about , the index lying on the last line , till through the sights ... Page 227

... carry that distance down by the edge of the scale parallel to it , to b ; and there describe an arc on the point b ; and if it just touches the ruler's edge , the point bis in the

... carry that distance down by the edge of the scale parallel to it , to b ; and there describe an arc on the point b ; and if it just touches the ruler's edge , the point bis in the

**true**place of the extended line .### What people are saying - Write a review

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### Common terms and phrases

acres altitude angle Answer arch base bearing called centre chains chord circle Co-sec Co-sine Co-tang column compasses contained decimal degrees Dep Lat difference direct Dist distance divided divisions draw drawn east edge equal EXAMPLE extended feet figures fixed four fourth give given glass greater ground half hand height Hence Horizon inches laid land Lat Dep latitude length less logarithm manner marked measure meridian method minutes multiplied natural object observed opposite parallel perches perpendicular plane pole PROB proportion Quadrant quotient radius reduce remainder right angles right line root rule scale Secant sect side sights sine square station Sun's suppose survey taken Tang tangent theo third triangle true whole

### 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 199 - 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.