A Treatise of Practical Surveying, ...1808 - 440 σελίδες |
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Σελίδα 115
... pole , whose height is 100 feet , be broken at D ; the upper part of which , DC , falls upon a horizontal plane , so that its extremity , C , is 34 feet from the bottom or foot of the pole . Required , the segments BD and DC . Geo ...
... pole , whose height is 100 feet , be broken at D ; the upper part of which , DC , falls upon a horizontal plane , so that its extremity , C , is 34 feet from the bottom or foot of the pole . Required , the segments BD and DC . Geo ...
Σελίδα 129
... poles or perches , which consist of 100 links ; ( and this is the most natural division ) or by one of 50 links ... pole one is 22 yards : hence the length of a link in a statute- chain is 7.92 inches . There are other perches used ...
... poles or perches , which consist of 100 links ; ( and this is the most natural division ) or by one of 50 links ... pole one is 22 yards : hence the length of a link in a statute- chain is 7.92 inches . There are other perches used ...
Σελίδα 130
... pole chain is 14 ; and the four- pole one is 28 yards : hence the length of a link in a plantation chain is 10.08 inches . The Scotch perch is 18 feet , or 6 yards , or 6 Scot's ells . In the shire of Cunningham in Scotland , their ...
... pole chain is 14 ; and the four- pole one is 28 yards : hence the length of a link in a plantation chain is 10.08 inches . The Scotch perch is 18 feet , or 6 yards , or 6 Scot's ells . In the shire of Cunningham in Scotland , their ...
Σελίδα 135
... pole , and others by a two - pole chain ; and as ground for houses is measured by feet , we will shew how to reduce one to the other , in the following pro- * blems . PROB . I. To reduce two - pole chains and links to four - pole ones ...
... pole , and others by a two - pole chain ; and as ground for houses is measured by feet , we will shew how to reduce one to the other , in the following pro- * blems . PROB . I. To reduce two - pole chains and links to four - pole ones ...
Σελίδα 136
... pole chains , and links , thus , Ch . L. 2. In 17. 42 of two - pole chains , how many four - pole ones ? Ch . L. Answer 8. 92 . PROB . II . To reduce four - pole chains and links , to two - polé ones . Double the chains , to which annex ...
... pole chains , and links , thus , Ch . L. 2. In 17. 42 of two - pole chains , how many four - pole ones ? Ch . L. Answer 8. 92 . PROB . II . To reduce four - pole chains and links , to two - polé ones . Double the chains , to which annex ...
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Συχνά εμφανιζόμενοι όροι και φράσεις
40 perches ABCD acres altitude Answer base bearing blank line centre chains and links chord circle circumferentor Co-fecant Secant Co-fine Co-tang column contained cyphers decimal decimal fraction diameter difference Dift Diſt distance line divided draw drawn east edge EXAMPLE feet field-book figures fore four-pole chains half the sum height hypothenuse inches instrument latitude logarithm measure meridian distance method multiplied needle number of degrees object off-sets parallel parallelogram perpendicular piece of ground plane Plate pole Portmarnock PROB protractor quotient radius right angles right line scale of equal second station sect semicircle side sights sine square root stationary distance stationary line sun's survey taken tangent thence theo theodolite thro trapezium triangle ABC trigonometry true amplitude two-pole chains vane variation Vulgar Fraction whence ΙΟ
Δημοφιλή αποσπάσματα
Σελίδα 32 - 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.
Σελίδα 199 - ... that triangles on the same base and between the same parallels are equal...
Σελίδα 94 - 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.
Σελίδα 23 - Four quantities are said to be in proportion when the product of the extremes is equal to that of the means : thus if A multiplied by D, be equal to B multiplied by C, then A is said to be to B as C is to D.
Σελίδα 95 - TO THEIR DIFFERENCE ; So IS THE TANGENT OF HALF THE SUM OF THE OPPOSITE ANGLES', To THE TANGENT OF HALF THEIR DIFFERENCE.
Σελίδα 37 - ABDE+ACGF the sum of the squares —BKLH-\-KCML, the sum of the two parallelograms or square BCMH; therefore the sum of the squares on AB and AC is equal to the square on BC.
Σελίδα 24 - Things that are equal to one and the same thing, are equal to each other. 2. Every whole is greater than its part. % 3. Every whole is equal to all its parts taken together. 4 If to equal things, equal things be added, the whole will be equal. 5. If from equal things, equal things be deducted the remainders will be equal.
Σελίδα 36 - XIII. •All parallelograms on the same or equal bases and between the same parallels...
Σελίδα 182 - VI. To find the content of a triangular piece of ground, Multiply the base by half the perpendicular, or the perpendicular by half the base ; or take half the product of the base into the perpendicular. The reason hereof is plain, from cor.
Σελίδα 35 - Triangles upon equal bases, and between the same parallels, are equal to one another.