The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skillful Practice of this Art |
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Page 14
... feet in a 2.0625 [ yard . 12 = number of inches in .7500 La foot . 12 number of lines in 9.0000 ' T'he answer here is 2 feet 9 lines . Lan inch , What is the value of .084 of a furlong ? Ans . 3 per . 1 yd . 2. ft . 11 in . What is the ...
... feet in a 2.0625 [ yard . 12 = number of inches in .7500 La foot . 12 number of lines in 9.0000 ' T'he answer here is 2 feet 9 lines . Lan inch , What is the value of .084 of a furlong ? Ans . 3 per . 1 yd . 2. ft . 11 in . What is the ...
Page 86
... feet long , when opened to its greatest extent . In describing the lines usually placed on this instrument , I refer to those com- monly laid down on the best six - inch brass sectors . But as the principles are the same in all , and ...
... feet long , when opened to its greatest extent . In describing the lines usually placed on this instrument , I refer to those com- monly laid down on the best six - inch brass sectors . But as the principles are the same in all , and ...
Page 92
... feet transversely to the scale con- cerned , and slide the feet along till they both rest on like divisions on both legs ; then will those di- visions shew the degrees and parts corresponding to the given line . To find the length of a ...
... feet transversely to the scale con- cerned , and slide the feet along till they both rest on like divisions on both legs ; then will those di- visions shew the degrees and parts corresponding to the given line . To find the length of a ...
Page 93
... size , according to the fancy or purposes of the draughtsman . They are , indeed , nothing more than a measure in miniature for laying down upon paper , & c . any known mea- sure , as chains , yards , feet , & DRAWING INSTRUMENTS 93.
... size , according to the fancy or purposes of the draughtsman . They are , indeed , nothing more than a measure in miniature for laying down upon paper , & c . any known mea- sure , as chains , yards , feet , & DRAWING INSTRUMENTS 93.
Page 94
... feet , & c . each part on the scale answering to one foot , one yard , & c , and the plan will be larger or smaller , as the scale contains a smaller or a greater number of parts in an inch . Hence a variety of scales is useful to lay ...
... feet , & c . each part on the scale answering to one foot , one yard , & c , and the plan will be larger or smaller , as the scale contains a smaller or a greater number of parts in an inch . Hence a variety of scales is useful to lay ...
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Common terms and phrases
ABCD acres altitude Answer arch base bearing centre chains and links circle circumferentor Co-sec Co-tang column compasses contained cube root decimal diagonal difference of latitude Dist divided divisions divisor draw east Ecliptic edge EXAMPLE feet field-book figure four-pole chains geometrical series given angle given number half the sum height Hence Horizon glass hypothenuse inches instrument length Logarithms measure meridian distance multiplied Natural Co-sines natural number natural sine Nonius number of degrees object observed off-sets opposite parallelogram perches perpendicular plane pole PROB proportional protractor Quadrant quotient radius rhombus right angles right line screw Secant sect semicircle side square root station subtract survey taken tance Tang tangent theo theodolite trapezium triangle ABC trigonometry two-pole chains vane versed sine vulgar fraction whence
Popular passages
Page 246 - ... that triangles on the same base and between the same parallels are equal...
Page 58 - 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 231 - RULE. From half the sum of the three sides subtract each side severally.
Page 45 - 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 14 - Then multiply the second and third terms together, and divide the product by the first term: the quotient will be the fourth term, or answer.
Page 5 - His method is founded on these three considerations: 1st, that the sum of the logarithms of any two numbers is the logarithm of the product of...
Page 91 - ... scale. Given the length of the sine, tangent, or secant of any degrees, to find the length of the radius to that sine, tangent, or secant.
Page 35 - DIVISION BY LOGARITHMS. RULE. From the logarithm of the dividend subtract the logarithm of the divisor, and the number answering to the remainder will be the quotient required.
Page 30 - Then, because the sum of the logarithms of numbers, gives the logarithm of their product ; and the difference of the logarithms, gives the logarithm of the quotient of the numbers ; from the above two logarithms, and the logarithm of 10, which is 1, we may obtain a great many logarithms, as in the following examples : EXAMPLE 3.
Page 211 - At 170 feet distance from the bottom of a tower, the angle of its elevation was found to be 52° 30' : required the altitude of the tower ? Ans.